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

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## Question number: 28

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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

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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

### 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

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