NEET Physics: Questions 878 - 881 of 2098

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Question number: 878

» Work, Energy and Power » Work Done

MCQ▾

Question

Choose the correct options -

(1) The work done by forces may be equal to change in kinetic energy

(2) The work done by forces may be equal to change in potential energy

(3) The work done by forces may be equal to change in total energy

(4) The work done by forces must be equal to change in potential energy.

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 3 are correct

c.

1 and 2 are correct

d.

2 and 4 are correct

Question number: 879

» Laws of Motion » Force and Inertia

MCQ▾

Question

A body of mass 50kg resting on a smooth inclined plane is connected by a massless inextensible string passing over a smooth pulley, at the top of the inclined plane have another mass of 40 kg as shown in the figure. The distance through which 50 kg mass fall in 4 sec will be - (The angle of the inclined plane is 30°)

Inclined plane with the mass resting on the plane

Inclined Plane With the Mass Resting on the Plane

Mass resting on inclined plane

Choices

Choice (4) Response

a.

1.304 m

b.

1.63m

c.

16.3m

d.

13.04 m

Question number: 880

» Laws of Motion » Laws of Friction

MCQ▾

Question

Two cars of unequal masses use similar tyres. If they are moving at the same initial speed, the minimum stopping distance -

Choices

Choice (4) Response

a.

is same for both cars

b.

is smaller for the heavier car

c.

is smaller for the lighter car

d.

Depends on the volume of the car

Question number: 881

» Laws of Motion » Laws of Friction

MCQ▾

Question

The work done by a person in carrying a box of mass 10 kg through a vertical height of 10 m is 4900 J. The mass of the person is -

Choices

Choice (4) Response

a.

60 kg

b.

130 kg

c.

50 kg

d.

40 kg

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