NEET Physics: Questions 808 - 813 of 2098

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Question number: 808

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

The resistance of a coil for dc is 5 ohm. In ac, the resistance will

Choices

Choice (4) Response

a.

Increase

b.

Decrease

c.

Be zero

d.

Remain same

Passage

Read the passage given below and answer the questions that follow:

A system consists of block A and B each of mass m connected by a light spring as shown in the figure with block B in contact with a wall. The block A compresses the spring by 3mg /k from natural length of spring and then released from rest. Neglect friction anywhere.

Block system with 2 blocks A and B

Block System With 2 Blocks a and B

In above figure we show that block A and B which connected with spring.

Question number: 809 (1 of 3 Based on Passage) Show Passage

» Experimental Skills » Screw Gauge

MCQ▾

Question

Maximum extension in the spring after system loses contact with wall

Choices

Choice (4) Response

a.

3mg2k

b.

3mg2k

c.

3mg2k

d.

None of the above

Question number: 810 (2 of 3 Based on Passage) Show Passage

» Experimental Skills » Screw Gauge

MCQ▾

Question

Velocity of center of mass of system comprising A ands when block B just loses contact with the wall

Choices

Choice (4) Response

a.

gmk

b.

3g2mk

c.

3gmk

d.

Question does not provide sufficient data or is vague

Question number: 811

» Work, Energy and Power » Work Done

MCQ▾

Question

The work done in pulling a body of mass 6 kg along an inclined plane (angle 45°) with coefficient of friction 0.2 through 2 m, will be -

Choices

Choice (4) Response

a.

91.08 J

b.

90.08 J

c.

98.08 J

d.

99.72 J

Question number: 812

» Laws of Motion » Laws of Friction

MCQ▾

Question

The contact force exerted by a body A on another body B is equal to the normal force between the bodies. We conclude that -

(1) The surfaces must be smooth

(2) Force of friction between two bodies may be equal to zero

(3) Magnitude of normal reaction is equal to that of friction

(4) Bodies may be rough

Which of the following options are correct?

Choices

Choice (4) Response

a.

1 and 4

b.

2 and 4

c.

1 and 2

d.

3 and 4

Question number: 813

» Work, Energy and Power » Potential Energy

MCQ▾

Question

The potential energy between two atoms in a molecule is given by, UX=aX12bX6 where a and b are positive constant and x is the distance between the atoms. The atoms is an stable equilibrium, when-

Choices

Choice (4) Response

a.

x=(2ab)16

b.

x=0

c.

x=(a2b)16

d.

x=x=(11a5b)16

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