Pressure MCQs

 In this blog I am going to write the mcqs from lesson Pressure, that are know to must for SEE appearing candidates and preparing for Class 11 science entrance examination. For any confusion regarding the topics, you can contact or do leave the comments. Thank you.

1. Pressure is defined as:
   a) Force × Area
   b) Force / Area
   c) Area / Force
   d) Mass × Acceleration
2. The SI unit of pressure is:
   a) Newton (N)
   b) Joule (J)
   c) Pascal (Pa)
   d) Watt (W)
3. One Pascal (Pa) is equivalent to:
   a) 1 N/m²
   b) 1 N·m
   c) 1 kg/m ³
   d) 1 m/s²
4. Which of the following factors does pressure exerted by a solid depend on?
   a) Only the force applied
   b) Only the area of contact
   c) Both force applied and area of contact
   d) The volume of the solid
5. A sharp knife cuts objects more effectively than a blunt knife because:
   a) It applies more force
   b) It has a smaller contact area, hence greater pressure
   c) It has a larger contact area, hence greater pressure
   d) It is made of a harder material
6. The pressure exerted by a liquid at a certain depth depends on:
   a) The shape of the container
   b) The area of the base of the container
   c) The depth and density of the liquid
   d) The volume of the liquid
7. The formula for calculating pressure in a liquid is P = hρg. What does 'ρ' represent?
   a) Depth
   b) Density of the liquid
   c) Acceleration due to gravity
   d) Pressure
8. As you go deeper into a liquid, the pressure:
   a) Decreases
   b) Increases
   c) Remains constant
   d) First increases then decreases
9. Liquids exert pressure:
   a) Only downwards
   b) Only sideways
   c) Only upwards
   d) In all directions
10. The property of a liquid to seek its own level is due to:
    a) Its viscosity
    b) Its surface tension
    c) The pressure it exerts
    d) Its density
11. Atmospheric pressure is the pressure exerted by:
    a) The water vapour in the air
    b) The weight of the air column above a surface
    c) The dust particles in the air
    d) The ozone layer
12. The instrument used to measure atmospheric pressure is called a:
    a) Manometer
    b) Thermometer
    c) Barometer
    d) Hydrometer
13. Standard atmospheric pressure at sea level is approximately:
    a) 760 Pa
    b) 1013 Pa
    c) 760 mm of Hg
    d) 100 N/m²
14. As altitude increases, atmospheric pressure:
    a) Increases
    b) Decreases
    c) Remains constant
    d) Becomes zero
15. A drinking straw works on the principle of:
    a) Liquid pressure
    b) Atmospheric pressure
    c) Pascal's law
    d) Archimedes' principle
16. Pascal's Law states that pressure applied to an enclosed fluid is:
    a) Transmitted only downwards
    b) Transmitted equally in all directions
    c) Decreased as it is transmitted
    d) Absorbed by the walls of the container
17. Which of the following devices works on Pascal's Law?
    a) Siphon
    b) Hydraulic press
    c) Dropper
    d) Barometer
18. In a hydraulic press, if F1 and A1 are the force and area of the smaller piston, and F2 and A2 are for the larger piston, then:
    a) F1/A1 = F2/A2
    b) F1 × A1 = F2 × A2
    c) F1/A2 = F2/A1
    d) F1 × A2 = F2 × A1
19. The upward force exerted by a fluid on an object immersed in it is called:
    a) Gravitational force
    b) Frictional force
    c) Upthrust or Buoyant force
    d) Viscous force
20. Archimedes' Principle states that the upthrust on an object is equal to:
    a) The weight of the object
    b) The volume of the object
    c) The weight of the fluid displaced by the object
    d) The density of the fluid
21. An object will float in a liquid if:
    a) Its density is greater than the density of the liquid
    b) Its density is less than the density of the liquid
    c) Its density is equal to the density of the liquid
    d) Its weight is greater than the upthrust
22. An object will sink in a liquid if:
    a) Upthrust is greater than its weight
    b) Upthrust is equal to its weight
    c) Upthrust is less than its weight
    d) Its volume is very small
23. The Law of Floatation states that a floating body displaces a fluid whose weight is:
    a) Greater than its own weight
    b) Less than its own weight
    c) Equal to its own weight
    d) Equal to its own volume
24. A ship made of iron floats in water because:
    a) Iron is lighter than water
    b) The average density of the ship (including air) is less than water
    c) Water exerts no pressure on the ship
    d) The ship material is porous
25. The density of freshwater is approximately:
    a) 1 g/cm³
    b) 10 g/cm³
    c) 0.1 g/cm³
    d) 100 g/cm³
26. Why are the foundations of high-rise buildings made wide?
    a) To increase the pressure on the ground
    b) To decrease the pressure on the ground
    c) To make the building look good
    d) To save construction material
27. A camel can walk easily in a desert because:
    a) It has long legs
    b) It has broad feet, reducing pressure on the sand
    c) It stores water in its hump
    d) Sand is very compact
28. The unit 'bar' is commonly used to measure:
    a) Liquid pressure
    b) Solid pressure
    c) Atmospheric pressure
    d) Blood pressure
29. 1 atmosphere (atm) is approximately equal to:
    a) 1 Pa
    b) 100 Pa
    c) 101325 Pa
    d) 760 Pa
30. A fluid is a substance that:
    a) Can flow
    b) Has a fixed shape
    c) Is always a liquid
    d) Is always a gas
31. If the area of contact is doubled, keeping the force constant, the pressure will be:
    a) Doubled
    b) Halved
    c) Quadrupled
    d) Remain the same
32. The pressure at a point inside a liquid is independent of:
    a) Depth of the point
    b) Density of the liquid
    c) Acceleration due to gravity
    d) Area of the cross-section of the container
33. A sphygmomanometer is used to measure:
    a) Atmospheric pressure
    b) Blood pressure
    c) Liquid density
    d) Air humidity
34. Water from a dam is supplied to a town. The pressure of water in the taps will be higher:
    a) In houses at the top of a hill
    b) In houses at the bottom of a valley
    c) Same in all houses
    d) Depends on the pipe diameter only
35. Torricelli invented the:
    a) Hydraulic Press
    b) Siphon
    c) Mercury Barometer
    d) Submarine
36. If an object is partially or fully immersed in a fluid, it experiences an apparent loss in weight. This is due to:
    a) Surface tension
    b) Viscosity
    c) Upthrust
    d) Density of the object
37. The relative density of a substance is the ratio of its density to the density of:
    a) Air at 0°C
    b) Water at 4°C
    c) Mercury at 0°C
    d) Any standard liquid
38. A body floats with 1/3 of its volume outside the water. What is the density of the body if the density of water is 1000 kg/m ³?
    a) 333.3 kg/m ³
    b) 666.7 kg/m ³
    c) 1000 kg/m ³
    d) 1333.3 kg/m ³
39. Why does a nose bleed sometimes occur at high altitudes?
    a) Due to increased atmospheric pressure
    b) Due to decreased atmospheric pressure causing blood vessels to expand
    c) Due to low oxygen levels
    d) Due to cold temperature
40. The principle of a siphon relies on:
    a) Pascal's Law
    b) Difference in liquid pressure due to height and atmospheric pressure
    c) Archimedes' Principle
    d) Surface tension
41. If the force applied on a surface is 100 N and the area is 2 m², the pressure exerted is:
    a) 200 Pa
    b) 50 Pa
    c) 0.02 Pa
    d) 102 Pa
42. Which of the following exerts the least pressure on a surface if they all have the same weight?
    a) A pointed heel
    b) A flat shoe
    c) A single finger tip
    d) All exert equal pressure
43. When a suction pump is used to draw water, the water rises in the pipe because:
    a) The pump pushes the water up
    b) Atmospheric pressure pushes the water up into the low-pressure area created by the pump
    c) The water's own pressure makes it rise
    d) Gravity pulls the water up
44. Pressure exerted by a gas in a closed container is due to:
    a) The weight of the gas molecules
    b) The collisions of gas molecules with the walls of the container
    c) The attraction between gas molecules
    d) The volume of the gas molecules
45. The value of 'g' (acceleration due to gravity) used in P = hρg is approximately:
    a) 9.8 m/s²
    b) 1 N/kg
    c) Both a and b are numerically equivalent in this context
    d) 10 Pa
46. Two identical containers A and B are filled with water and mercury respectively to the same height. The pressure at the bottom will be:
    a) Greater in A
    b) Greater in B (since mercury is denser than water)
    c) Equal in both
    d) Cannot be determined
47. Hydraulic brakes in automobiles work on the principle of:
    a) Archimedes' Principle
    b) Newton's laws of motion
    c) Pascal's Law
    d) Law of Floatation
48. What happens to the upthrust on an object when it is taken from freshwater to saltwater? (Saltwater is denser than freshwater)
    a) Upthrust increases
    b) Upthrust decreases
    c) Upthrust remains the same
    d) Upthrust becomes zero
49. A force of 50 N is applied to a smaller piston of a hydraulic machine with an area of 0.1 m². If the larger piston has an area of 1 m², the force exerted by the larger piston is:
    a) 5 N
    b) 50 N
    c) 500 N
    d) 5000 N
50. Which of the following statements is INCORRECT regarding pressure in liquids?
    a) Pressure increases with depth.
    b) Pressure at the same depth is equal in all directions.
    c) Pressure depends on the shape of the container.
    d) Pressure is exerted on the walls of the container.

 

Happy Learning

 

Entrance Based Objective Question for Class 11

 

Here is a detailed blog post on "Force (Entrance Based Objective Question for Class 11)". In the present post, we start from the fundamentals of force and then we present 50 multiple‐choice questions (MCQs) with explanations. The MCQs that are given in this file are of following topics Newton’ s laws of motion Type of forces Equilibrium Friction And much more. Go through the explanation, try the questions and check the explanation to strengthen your hold on the course.

Force is one of the most fundamental concepts in physics. In everyday language, force is often associated with a “push” or a “pull.” In physics, however, force is a vector quantity (meaning it has both magnitude and direction) and is defined as the interaction that causes an object to accelerate according to Newton’s laws of motion.

Key points to remember:
• The SI unit of force is the Newton (N).
• Newton’s First Law (Law of Inertia) states that an object at rest remains at rest or continues in uniform motion unless acted upon by a net external force.
• Newton’s Second Law gives the relationship F = ma (where F is net force, m is mass, and a is acceleration).
• Newton’s Third Law tells us that every action has an equal and opposite reaction.
• Forces can be contact forces (like friction, tension, and normal force) or non-contact forces (like gravitational, magnetic, or electrostatic force).

1.    Which of the following is the SI unit of force?
A) Joule B) Watt C) Newton D) Pascal
• Explanation: The SI unit of force is the Newton (N).

2.    Which law of motion is known as the law of inertia?
A) Newton’s First Law B) Newton’s Second Law C) Newton’s Third Law D) Hooke’s Law
• Explanation: Newton’s First Law states that an object will remain at rest or move at a constant velocity unless acted upon by a net external force.

3.    Newton’s Second Law of Motion is best expressed by the equation:
A) F = mv B) F = ma C) F = m/v D) F = m + a
• Explanation: Newton’s Second Law is given by F = ma, relating net force, mass, and acceleration.

4.    According to Newton’s Third Law, when you push against a wall, the wall pushes back with:
A) A smaller force B) The same force C) No force D) A variable force
• Explanation: Newton’s Third Law states that every force has an equal and opposite reaction.

5.    If the net force acting on an object is zero, the object will:
A) Accelerate B) Remain at rest or move with constant velocity C) Change direction D) Increase its mass
• Explanation: When net force is zero, an object is in equilibrium, meaning no acceleration occurs.

6.    A force that acts through direct contact with an object is called a:
A) Non-contact force B) Gravitational force C) Contact force D) Magnetic force
• Explanation: Examples include friction, tension, and normal force, which require physical contact.

7.    Which of the following forces is an example of a non-contact force?
A) Friction B) Tension C) Normal D) Gravitational
• Explanation: Gravitational force acts at a distance without direct contact.

8.    What happens to an object’s acceleration if the applied net force is doubled while the mass remains unchanged?
A) It halves B) It doubles C) It remains same D) It quadruples
• Explanation: According to F = ma, doubling F doubles a if mass stays constant.

9.    An object of mass 4 kg experiences an acceleration of 5 m/s². What is the magnitude of the net force on the object?
A) 9 N B) 20 N C) 25 N D) 45 N
• Explanation: F = ma = 4 × 5 = 20 N.

10. Which type of friction acts when an object is in motion relative to a surface?
A) Static friction B) Rolling friction C) Kinetic friction D) Fluid friction
• Explanation: Kinetic friction occurs when there is relative motion between surfaces.

11. Static friction is:
A) Always greater than kinetic friction B) Always less than kinetic friction C) Equal to kinetic friction D) Irrelevant in motion
• Explanation: Generally, static friction (preventing motion) is higher than kinetic friction (during motion).

12. When an object is in equilibrium, the sum of forces acting on it is:
A) Positive B) Negative C) Zero D) Undefined
• Explanation: Equilibrium implies the net force is zero.

13. Which of the following best describes weight?
A) A measure of mass B) A measure of gravitational force C) A type of friction D) A scalar quantity
• Explanation: Weight is the gravitational force acting on an object and is a vector.

14. The weight of an object is given by:
A) mg (mass times gravitational acceleration) B) m/g C) m + g D) m - g
• Explanation: Weight = mg, where g is the acceleration due to gravity.

15. In free-fall (neglecting air resistance), all objects fall with the same acceleration because:
A) Their masses are equal B) Gravitational force is the same C) The acceleration due to gravity is constant D) Air resistance cancels out differences
• Explanation: All objects accelerate at g (approximately 9.8 m/s²) near Earth’s surface regardless of mass.

16. If two forces of equal magnitude act on an object in opposite directions, the net force is:
A) Zero B) Sum of the forces C) Difference of the forces D) Undefined
• Explanation: Equal and opposite forces cancel each other resulting in zero net force.

17. What is the effect of friction on moving objects?
A) It increases their speed B) It opposes their motion C) It changes their mass D) It acts only when objects are at rest
• Explanation: Friction opposes the relative motion between surfaces.

18. Which of the following is true about centripetal force?
A) It pushes an object outward B) It is required for circular motion C) It acts along the tangent to a circle D) It is a fictitious force
• Explanation: Centripetal force acts toward the center of the circle, keeping an object in circular motion.

19. A net force directed to the right on a stationary object will cause the object to:
A) Remain stationary B) Accelerate to the right C) Accelerate to the left D) Change direction randomly
• Explanation: The object will begin accelerating in the direction of the net force.

20. The deformation (stretching or compressing) of an object when a force is applied is described by:
A) Elasticity B) Inertia C) Viscosity D) Plasticity
• Explanation: Elasticity describes how materials return to their original shape after deformation.

21. Hooke’s Law is applicable to:
A) Perfectly plastic materials B) Elastic materials C) Inelastic collisions D) Fluids
• Explanation: Hooke’s Law (F = kx) holds for materials that obey elastic behavior.

22. In Hooke’s Law, “k” stands for:
A) Curvature B) Spring constant C) Kinetic energy D) Mass constant
• Explanation: “k” is the spring constant, reflecting the stiffness of the spring.

23. If a spring with k = 50 N/m is stretched 0.2 m from its natural length, the restoring force is:
A) 5 N B) 10 N C) 25 N D) 100 N
• Explanation: F = kx = 50 × 0.2 = 10 N.

24. Which force is responsible for keeping planets in orbit around the sun?
A) Magnetic force B) Nuclear force C) Gravitational force D) Elastic force
• Explanation: Gravitational force provides the centripetal force that keeps planets in orbit.

25. The frictional force that opposes the rotation of a wheel is called:
A) Static friction B) Rolling friction C) Kinetic friction D) Fluid friction
• Explanation: Rolling friction resists motion when an object rolls over a surface.

26. In the absence of friction, an object sliding on a horizontal surface will:
A) Eventually stop B) Move with constant velocity C) Accelerate indefinitely D) Move erratically
• Explanation: Without friction, an object continues in motion with constant velocity per Newton’s First Law.

27. Which factor does NOT affect the magnitude of frictional force?
A) Nature of the surfaces B) Normal force C) Surface area of contact D) Coefficient of friction
• Explanation: Although surface area might seem important, for many cases the frictional force is independent of the contact area and depends mainly on the normal force and the coefficient of friction.

28. An unbalanced force acting on an object:
A) Leaves the object in equilibrium B) Causes acceleration C) Reduces its mass D) Has no effect on motion
• Explanation: An unbalanced force changes the state of motion, causing acceleration.

29. When an object moves in a circle at constant speed, it is accelerating because:
A) Its speed increases B) Its direction of motion changes C) Its mass increases D) It experiences friction only
• Explanation: The change in direction of the velocity vector means there is centripetal acceleration.

30. The net force acting on an object undergoing uniform circular motion is directed:
A) Tangentially B) Radially outward C) Radially inward D) Opposite to the velocity
• Explanation: The net (centripetal) force is directed inward toward the circle’s center.

31. When two objects collide and exert forces on each other, the forces experienced are:
A) Unequal B) Equal in magnitude and opposite in direction C) Only gravitational D) Dependent on their speed only
• Explanation: Newton’s Third Law applies; they are equal and opposite.

32. In a tug-of-war where both teams pull with equal force, the rope remains:
A) In motion B) Stationary C) Accelerating D) Unpredictable
• Explanation: Equal forces on both sides produce zero net force, keeping the rope stationary.

33. Which of the following is NOT a vector quantity?
A) Force B) Velocity C) Acceleration D) Mass
• Explanation: Mass is a scalar; it has magnitude only, no direction.

34. The impulse delivered to an object is equal to:
A) The change in its velocity B) The change in its momentum C) Its weight multiplied by time D) The work done on the object
• Explanation: Impulse equals the change in momentum (Impulse = FΔt).

35. The unit of impulse is:
A) Newton B) Joule C) Newton-second D) Pascal
• Explanation: Since impulse has dimensions of force multiplied by time, its unit is N·s.

36. For an object of constant mass, an increase in net force will result in:
A) A decrease in acceleration B) No change in acceleration C) An increase in acceleration D) A change in mass
• Explanation: F = ma implies acceleration increases with net force if mass is constant.

37. Which scenario best illustrates balanced forces?
A) A car accelerating on a highway B) A book lying at rest on a table C) A ball thrown upwards D) A rocket launching
• Explanation: The book on the table is in equilibrium (balanced gravitational and normal forces).

38. When an object is thrown upwards, the net force acting on it (ignoring air resistance) is:
A) Upward B) Downward C) Zero D) Alternating
• Explanation: Gravity always acts downward regardless of the initial upward motion.

39. In the equation F = ma, if mass is doubled while force remains constant, acceleration will:
A) Double B) Halve C) Remain the same D) Quadruple
• Explanation: Acceleration is inversely proportional to mass; doubling mass halves acceleration.

40. What is the net force on an object if two forces of 15 N and 10 N act in the same direction and one force of 5 N acts in the opposite direction?
A) 20 N B) 15 N C) 10 N D) 5 N
• Explanation: Net force = 15 + 10 − 5 = 20 N in the direction of the larger force sum.

41. The term “resultant force” refers to:
A) The smallest force in a system B) The vector sum of all forces acting on an object C) The friction only D) A scalar addition of forces
• Explanation: Resultant force is determined by vector addition of all individual forces.

42. An increase in the coefficient of friction between two surfaces will generally cause:
A) Lower frictional force B) Higher frictional force C) No change in friction D) A decrease in normal force
• Explanation: A higher coefficient increases the frictional force as f = μN.

43. When a force is applied at an angle to the horizontal, the horizontal component is given by:
A) F sin θ B) F cos θ C) F tan θ D) F/θ
• Explanation: The horizontal component equals F cos θ, where θ is the angle with the horizontal.

44. For a fixed force applied at an angle, as the angle increases from 0° to 90°, the horizontal component of the force:
A) Increases B) Decreases C) Remains constant D) First increases then decreases
• Explanation: The horizontal component (F cos θ) decreases as θ increases.

45. Which of the following does NOT affect the net force on an object?
A) Magnitude of individual forces B) Directions of forces C) Time over which forces act D) Relative angles between forces
• Explanation: The net force is determined by the instantaneous vector sum of forces; time isn’t directly a factor unless impulse is considered.

46. In uniform linear motion with no acceleration, how do the applied forces compare to the opposing forces?
A) Applied forces are greater B) Opposing forces are greater C) Both are equal D) Opposing forces are zero
• Explanation: In uniform motion, forces are balanced, meaning applied and opposing forces are equal.

47. Which scenario demonstrates an object in static equilibrium?
A) A car braking B) A satellite orbiting Earth C) A hanging picture frame supported by a nail D) A ball rolling down a hill
• Explanation: In static equilibrium, as with a hanging picture frame, all forces balance so that the net force is zero.

48. In the context of forces, the term “net force” means:
A) The largest individual force acting on an object B) The difference between upward and downward forces C) The sum of all forces taking into account their directions D) Only the frictional forces
• Explanation: Net force is the vector sum of all individual forces acting on the object.

49. When an object is subject to a varying force over time, the impulse is equal to:
A) Maximum force multiplied by time B) Average force multiplied by time interval C) The sum of distances traveled D) The product of mass and velocity
• Explanation: For a variable force, impulse can be approximated by (average force × time interval) or calculated using integration.

50. A student applies a force that increases gradually on a cart. Initially, the cart does not move because static friction is greater than the applied force. This is an example of:
A) Newton’s Second Law B) Overcoming inertia C) The difference between static and kinetic friction D) Conservation of momentum
• Explanation: This scenario illustrates the difference between static friction (which must first be overcome) and kinetic friction.

Happy Learning and good luck for your entrance exam

Limiting Reactant

 Limiting Reactant MCQs  for Grade 11

Here is the most important list of mcqs that can be asked from the lesson Limiting Reactant.

 Alcohol ( R-OH)

Alcohol is one of the demanding chemical products in the current world. As it serves the precursor for many other products its production has been incresing. Not only for making other chemical substances, but for making alcoholic beverages also, its use has been increased. 

To make know the students about alcohol, the course has included the topic "ALCOHOL".

Most of the students feel difficulty as they do not know the exact what happens in the chemical reaction.

To simplify the learning here I have prepared the complete note on Alcohol. Enjoy learning.

 

 SEE send up examination 2079. (Model Question)

Here is one of the standard sets of questions that were asked in Buddhabhumi municipality.

This paper is standard one as we can see the last year's compulsory mathematics paper in the standard format. Hope you will absolutely follow this model for your upcoming examination and secure a good GPA.

Enjoy learning.

 Preparation of Haloalkane (R-X)

For more details, you can watch me at

Preparation of Haloalkane

Common Mistakes made by students in high school mathematics.

 As a mathematics lover as well as a teacher, I have seen many students making simple but recurrent mistakes in school-level mathematics. These silly mistakes make the students score low in their examinations.

for example:

solve x(x-3) = 0

here most of the students solve like this

  x-3 =0

or, x= 3

But it's wrong. The reason behind this is 

when we open the brackets we have x^2 which means it becomes a quadratic equation. And we should know that each quadratic equation has two definite solutions. 

Therefore, x= 0 and 3 will be the true solution.

We can find such mistakes in large numbers in mathematics. this is just due to lack of concept on the topic.

What to do then??

Simple, grab the concept on the topic.

You can find more such recurring mistakes and their remedy in the specially designed video.

Mistakes in mathematics