NEST (National Entrance Screening Test) Physics: Questions 28 - 29 of 58

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Question number: 28

» Electrostatics » Capacitors

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Appeared in Year: 2009

MCQ▾

Question

Consider two situations: (a) A capacitor of capacitance is changed by a battery of volatge , and the battery is disconnected. (b) The same capacitor is charged is charged by the same battery, which however, is kept connected. Next, in both cases, a thin dielectric slab is inserted between the capacitor plates. (Earlier there was only air). Let and denote the electrostatic energies in the two situations. Which of the following is true?

Choices

Choice (4) Response

a.

and decrease.

b.

increases while decreases.

c.

increases while decreases.

d.

and increase.

Question number: 29

» Rotational Motion » Concepts of Rotational Motion

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Appeared in Year: 2015

MCQ▾

Question

A wall clock is transparent and can be viewed both from front and rear. The front view is depicted in the figure (only the second hand is shown). The positive – direction is out of the plane of the paper. The second hand when viewed from the rear moves in

Figure of Front view of transparent clock

Figure of Front View of Transparent Clock

In figure front view of transparent clock is shown

Choices

Choice (4) Response

a.

The clockwise direction and its angular velocity is in the direction

b.

The anti – clockwise direction and its angular velocity is in the direction

c.

The anti – clockwise direction and its angular velocity is in the direction

d.

The clockwise direction and its angular velocity is in the direction