NEET Physics: Questions 824 - 828 of 2142

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Question number: 824

» Work, Energy and Power » Elastic and Inelastic Collisions

MCQ▾

Question

Two balls at the same temperature collide inelastically. Which of the following is not conserved?

(a) 1, 2 and 3 are correct

(b) 1 and 2 are correct

(c) 2 and 4 are correct

(d) 1 and 3 are correct

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

Choices

Choice (4) Response

a.

Velocity

b.

Kinetic energy

c.

Momentum

d.

Temperature

Question number: 825

» Work, Energy and Power » Work Done

MCQ▾

Question

An object of mass 5 kg falls from rest through a vertical distance of 20 m and reaches a velocity of 10 m/s. How much work is done by the push of the air on the object? (g = 10 m/s 2).

Choices

Choice (4) Response

a.

200 J

b.

350 J

c.

750 J

d.

300 J

Question number: 826

» Work, Energy and Power » Work Done

MCQ▾

Question

A chain of linear density 3 kg/m and length 8 m is lying on the table with 2 m of chain hanging from the edge. The work done in lifting the chain on the table will be –

Choices

Choice (4) Response

a.

17.6 J

b.

4.8 J

c.

5.2 J

d.

1.6 J

Question number: 827

» Laws of Motion » Laws of Friction

MCQ▾

Question

A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. A force F of 2.5 N is applied on the block, as shown. Calculate the force of friction between the block and the floor, (g = 9.8 ms -2)

Choices

Choice (4) Response

a.

zero

b.

7.84 N

c.

2.5 N

d.

25 N

Question number: 828

» Laws of Motion » Laws of Friction

MCQ▾

Question

A block is kept on a horizontal table. The table is undergoing simple harmonic motion of frequency 3 Hz in a horizontal plane. The coefficient of static friction between the block and the table surface is 0.72. Find the maximum amplitude of the table at which the block does not slip on the surface (g = 10 ms -2)

Choices

Choice (4) Response

a.

0.03 m

b.

0.02 m

c.

0.01 m

d.

0.04 m

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