Quiz - physics - Laws of motion-PYQ

Q1. Physical independence of force is a consequence of Source: orcusprep.in

NEET 1991

easy

third law of motion

second law of motion

first law of motion

all of these laws

Q2. A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is dropped from a height 100% more than the previous height, the momentum when it hits the ground will change by (NEET Mains 2012) Source: orcusprep.in

NEET Mains 2012

medium

68%

41%

200%

100%

Q3. A body, under the action of a force \( \vec{F} = 6\hat{i} - 8\hat{j} + 10\hat{k} \), acquires an acceleration of 1 m/s\(^{2}\). The mass of this body must be (NEET 2009) Source: orcusprep.in

NEET 2009

medium

10 kg

20 kg

\( 10\sqrt{2} \) kg

\( 2\sqrt{10} \) kg

Q4. Sand is being dropped on a conveyer belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of v m/s will be (NEET 2008) Source: orcusprep.in

NEET 2008

medium

\( Mv^2 \) newton

zero

Mv newton

2 Mv newton

Q5. An object of mass 3 kg is at rest. Now a force of \( \vec{F} = 6t\hat{i} + 4t\hat{j} \) is applied on the object then velocity of object at t = 3 s is (NEET 2002) Source: orcusprep.in

NEET 2002

hard

\( 18\hat{i} + 3\hat{j} \)

\( 18\hat{i} + 6\hat{j} \)

\( 3\hat{i} + 18\hat{j} \)

\( 18\hat{i} + 4\hat{j} \)

Q6. A cricketer catches a ball of mass 150 gm in 0.1 sec moving with speed 20 m/s, then he experiences force of (NEET 2001) Source: orcusprep.in

NEET 2001

easy

300 N

30 N

3 N

0.3 N

Q7. If the force on a rocket, moving with a velocity of 300 m/s is 210 N, then the rate of combustion of the fuel is (NEET 1999) Source: orcusprep.in

NEET 1999

easy

0.07 kg/s

1.4 kg/s

0.7 kg/s

10.7 kg/s

Q8. A bullet is fired from a gun. The force on the bullet is given by F = 600 – 2 \( \times \) 10\(^{5}\) t where, F is in newton and t in seconds. The force on the bullet becomes zero as soon as it leaves the barrel. What is the average impulse imparted to the bullet? (NEET 1998) Source: orcusprep.in

NEET 1998

hard

9 Ns

zero

1.8 Ns

0.9 Ns

Q9. A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 m s\(^{-1}\). To give an initial upward acceleration of 20 m s\(^{-2}\), the amount of gas ejected per second to supply the needed thrust will be (g = 10 m s\(^{-2}\)) (NEET 1998) Source: orcusprep.in

NEET 1998

hard

185.5 kg s\(^{-1}\)

187.5 kg s\(^{-1}\)

127.5 kg s\(^{-1}\)

137.5 kg s\(^{-1}\)

Q10. A force of 6 N acts on a body at rest and of mass 1 kg. During this time, the body attains a velocity of 30 m/s. The time for which the force acts on the body is (NEET 1997) Source: orcusprep.in

NEET 1997

easy

7 seconds

5 seconds

10 seconds

8 seconds

Q11. A 10 N force is applied on a body produce in it an acceleration of 1 m/s\(^{2}\). The mass of the body is (NEET 1996) Source: orcusprep.in

NEET 1996

easy

15 kg

20 kg

10 kg

5 kg

Q12. A force vector applied on a mass is represented as \( \vec{F} = 6\hat{i} - 8\hat{j} + 10\hat{k} \) and accelerates with 1 m/s\(^{2}\). What will be the mass of the body? (NEET 1996) Source: orcusprep.in

NEET 1996

medium

10 kg

20 kg

\( 10\sqrt{2} \) kg

\( 2\sqrt{10} \) kg

Q13. In a rocket, fuel burns at the rate of 1 kg/s. This fuel is ejected from the rocket with a velocity of 60 km/s. This exerts a force on the rocket equal to (NEET 1994) Source: orcusprep.in

NEET 1994

easy

6000 N

60000 N

60 N

600 N

Q14. A satellite in force free space sweeps stationary interplanetary dust at a rate of dM/dt = \( \alpha v^2 \), where M is mass and v is the speed of satellite and \( \alpha \) is a constant. The acceleration of satellite is (NEET 1994) Source: orcusprep.in

NEET 1994

hard

\( -\alpha \frac{v^3}{M} \)

\( -\alpha v^2 \)

\( -2\alpha \frac{v^2}{M} \)

\( -\frac{\alpha v^2}{M} \)

Q15. A particle of mass m is moving with a uniform velocity v1. It is given an impulse such that its velocity becomes v2. The impulse is equal to (NEET 1990) Source: orcusprep.in

NEET 1990

easy

\( m[|v_2| - |v_1|] \)

\( \frac{1}{2}m[v_2^2 - v_1^2] \)

\( m[v_1 + v_2] \)

\( m[v_2 - v_1] \)

Q16. A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 m s\(^{-1}\), the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is (NEET 1990) Source: orcusprep.in

NEET 1990

easy

117.6 kg s\(^{-1}\)

58.6 kg s\(^{-1}\)

6 kg s\(^{-1}\)

76.4 kg s\(^{-1}\)

Q17. A 10 N force is applied on a body produce in it an acceleration of 1 m/s\(^{2}\). The mass of the body is (NEET 1996) Source: orcusprep.in

NEET 1996

easy

15 kg

20 kg

10 kg

5 kg

Q18. A force vector applied on a mass is represented as \( \vec{F} = 6\hat{i} - 8\hat{j} + 10\hat{k} \) and accelerates with 1 m/s\(^{2}\). What will be the mass of the body? (NEET 1996) Source: orcusprep.in

NEET 1996

medium

10 kg

20 kg

\( 10\sqrt{2} \) kg

\( 2\sqrt{10} \) kg

Q19. In a rocket, fuel burns at the rate of 1 kg/s. This fuel is ejected from the rocket with a velocity of 60 km/s. This exerts a force on the rocket equal to (NEET 1994) Source: orcusprep.in

NEET 1994

easy

6000 N

60000 N

60 N

600 N

Q20. A particle of mass m is moving with a uniform velocity v1. It is given an impulse such that its velocity becomes v2. The impulse is equal to (NEET 1990) Source: orcusprep.in

NEET 1990

easy

\( m[|v_2| - |v_1|] \)

\( \frac{1}{2}m[v_2^2 - v_1^2] \)

\( m[v_1 + v_2] \)

\( m[v_2 - v_1] \)

Q21. A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 m s\(^{-1}\), the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is (NEET 1990) Source: orcusprep.in

NEET 1990

easy

117.6 kg s\(^{-1}\)

58.6 kg s\(^{-1}\)

6 kg s\(^{-1}\)

76.4 kg s\(^{-1}\)

Q22. A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The impulse experienced by the body is (NEET 2011) Source: orcusprep.in

NEET 2011

easy

MV

1.5MV

2MV

zero

Q23. A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of 30\(^\circ\) with the wall. It is reflected with the same speed at the same angle. If the ball is in contact with the wall for 0.25 seconds, the average force acting on the wall is (NEET 2006) Source: orcusprep.in

NEET 2006

hard

96 N

48 N

24 N

12 N

Q24. A body of mass 3 kg hits a wall at an angle of 60\(^\circ\) and returns at the same angle. The impact time was 0.2 s. The force exerted on the wall (NEET 2000)

(Given that velocity is 10 m/s) Source: orcusprep.in

NEET 2000

hard

150 \( \sqrt{3} \) N

50 \( \sqrt{3} \) N

100 N

75 \( \sqrt{3} \) N

Q25. An object flying in air with velocity \( (20\hat{i} + 25\hat{j} - 12\hat{k}) \) suddenly breaks in two pieces whose masses are in the ratio 1 : 5. The smaller mass flies off with a velocity \( (100\hat{i} + 35\hat{j} + 8\hat{k}) \). The velocity of the larger piece will be (Odisha NEET 2019) Source: orcusprep.in

NEET Odisha 2019

hard

\( 4\hat{i} + 23\hat{j} - 16\hat{k} \)

\( -100\hat{i} - 35\hat{j} - 8\hat{k} \)

\( 20\hat{i} + 15\hat{j} - 80\hat{k} \)

\( -20\hat{i} - 15\hat{j} - 80\hat{k} \)

Q26. An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 m s\(^{-1}\) and the second part of mass 2 kg moves with 8 m s\(^{-1}\) speed. If the third part flies off with 4 m s\(^{-1}\) speed, then its mass is (NEET 2013) Source: orcusprep.in

NEET 2013

medium

7 kg

17 kg

3 kg

5 kg

Q27. A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 m s\(^{-1}\). The final velocity acquired by the person and the average force exerted on the person are (Karnataka NEET 2013) Source: orcusprep.in

NEET Karnataka 2013

hard

\( -0.08 \,\text{m s}^{-1}, 16 \,\text{N} \)

\( -0.8 \,\text{m s}^{-1}, 8 \,\text{N} \)

\( -1.6 \,\text{m s}^{-1}, 16 \,\text{N} \)

\( -1.6 \,\text{m s}^{-1}, 8 \,\text{N} \)

Q28. A block of mass m is placed on a smooth inclined wedge ABC of inclination θ as shown in the figure. The wedge is given an acceleration a towards the right. The relation between a and θ for the block to remain stationary on the wedge is Source: orcusprep.in

NEET 2018

hard

a = g cosecθ

a = g sinθ

a = g cosθ

a = g tanθ

Q29. Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively Source: orcusprep.in

NEET 2017

medium

g/3, g

g, g

g/3, g/3

g, g/3

Q30. A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a ? Source: orcusprep.in

NEET 2014

medium

2m/(g+a)

2ma/(g-a)

ma/(g+a)

ma/(g-a)

Q31. Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity) Source: orcusprep.in

NEET 2013

easy

3mg

6mg

zero

2mg

Q32. A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s². If g = 10 m s⁻², the tension in the supporting cable is Source: orcusprep.in

NEET 2011

medium

8600 N

9680 N

11000 N

1200 N

Q33. The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is Source: orcusprep.in

NEET 2009

easy

4 m s⁻² upwards

4 m s⁻² downwards

14 m s⁻² upwards

30 m s⁻² downwards

Q34. A block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block will be (g is acceleration due to gravity) Source: orcusprep.in

NEET 2004

hard

mg cosθ

mg sinθ

mg

mg/cosθ

Q35. A man weighs 80 kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5 m/s². What would be the reading on the scale ? (g = 10 m/s²) Source: orcusprep.in

NEET 2003

easy

zero

400 N

800 N

1200 N

Q36. A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope? (g = 10 m/s²) Source: orcusprep.in

NEET 2003

medium

5 m/s²

10 m/s²

25 m/s²

2.5 m/s²

Q37. A lift of mass 1000 kg which is moving with acceleration of 1 m/s² in upward direction, then the tension developed in string which is connected to lift is Source: orcusprep.in

NEET 2002

easy

9800 N

10,800 N

11,000 N

10,000 N

Q38. Two masses as shown in the figure are suspended from a massless pulley. The acceleration of the system when masses are left free is Source: orcusprep.in

NEET 2000

easy

2g/3

g/3

g/9

g/7

Q39. A mass of 1 kg is suspended by a thread. It is (i) lifted up with an acceleration 4.9 m/s², (ii) lowered with an acceleration 4.9 m/s². The ratio of the tensions is Source: orcusprep.in

NEET 1998

medium

1 : 3

1 : 2

3 : 1

2 : 1

Q40. A mass M is placed on a very smooth wedge resting on a surface without friction. Once the mass is released, the acceleration to be given to the wedge so that M remains at rest is a where Source: orcusprep.in

NEET 1998

hard

a is applied to the left and a = g tanθ

a is applied to the right and a = g tanθ

a is applied to the left and a = g sinθ

a is applied to the left and a = g cosθ

Q41. A monkey is decending from the branch of a tree with constant acceleration. If the breaking strength of branch is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without breaking the branch is Source: orcusprep.in

NEET 1993

medium

g

3g/4

g/4

g/2

Q42. The force F acting on a particle of mass m is indicated by the force-time graph as shown. The change in momentum of the particle over the time interval from zero to 8 s is Source: orcusprep.in

NEET 2014

easy

24 N-s

20 N-s

12 N-s

6 N-s

Q43. A box of mass 5 kg is pulled by a cord, up along a frictionless plane inclined at 30° with the horizontal. The tension in the cord is 30N. The acceleration of the box is (Take g = 10m s⁻²;) Source: orcusprep.in

NEET 2024 Re

easy

2 m s⁻²

Zero

0.1 m s⁻²

1 m s⁻²

Q44. A horizontal force 10N is applied to a block A as shown in figure. The mass of blocks A and B are 2kg and 3 kg respectively. The blocks slide over a frictionless surface. The force exerted by block A on block B is : Source: orcusprep.in

NEET 2024

easy

Zero

4N

6N

10N

Q45. A 1kg object strikes a wall with velocity 1m s⁻¹ at an angle of 60° with the wall and reflects at the same angle. If it remains in contact with wall for 0.1 s, then the force exerted on the wall is :- Source: orcusprep.in

NEET 2023 mpr

medium

30√3N

Zero

10√3N

20√3N

Q46. A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is Source: orcusprep.in

NEET 2023

easy

Along northward.

Along north-east

Along south-west

Along eastward

Q47. A ball of mass 0.15 kg is dropped from a height 10 m, strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is (g = 10 m/s²) nearly Source: orcusprep.in

NEET 2021

medium

0 kg m/s

4.2 kg m/s

2.1 kg m/s

1.4 kg m/s

Q48. Two bodies of mass 4kg and 6kg are tied to the ends of a massless

string. The string passes over a pulley which is frictionless (see

figure).

The acceleration of the system in terms of acceleration due to

gravity (g) is:
[2020] Source: orcusprep.in

NEET 2020

easy

g

g/2

g/5

g/10

Q49. In the diagram shown, the normal reaction force between 2 kg and
1 kg is (Consider the surface, to be smooth) : Given g = 10m/s² Source: orcusprep.in

RE-NEET 2022

easy

10

25

39

6

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Physics - Laws of motion-PYQ

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Physics - Laws of motion-PYQ

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