# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 45 - 46 of 268

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## Question number: 45

Appeared in Year: 2011

MCQ▾

### Question

A rectangular loop of wire shown below is coplanar with a long wire carrying current I.

The loop is pulled to the right as indicated. What are the directions of the induced current in the loop and the magnetic forces on the left and the right sides of the loop?

### Choices

Choice (4) Response

a.

Induced current → Clockwise, Force on left side → To the left, Force on right side → To the right

b.

Induced current → Counterclockwise, Force on left side → To the right, Force on right side → To the left

c.

Induced current → Clockwise, Force on left side → To the right, Force on right side → To the left

d.

Induced current → Counterclockwise, Force on left side → To the left, Force on right side → To the right

## Question number: 46

Appeared in Year: 2012

MCQ▾

### Question

A parent nucleus X is decaying into daughter nucleus Y which in turn decays to Z. The half-lives of X and Y are 4000 years and 20 years respectively. In a certain sample, it is found that the number of Y nuclei hardly changes with time. If the number of X nuclei in the sample is 4 × 1020, the number of Y nuclei present in it is –

### Choices

Choice (4) Response

a.

b.

c.

d.

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