# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 85 - 87 of 268

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## Question number: 85

Appeared in Year: 2013

MCQ▾

### Question

A ray of light incident on a glass sphere suffers total internal reflection before emerging out exactly parallel to the incident ray. The angle of incidence was –

### Choices

Choice (4) Response

a.

300

b.

750

c.

600

d.

450

## Question number: 86

Appeared in Year: 2013

MCQ▾

### Question

A black box (BB) which may contain a combination of electrical circuit elements (resistor, capacitor or inductor) is connected with other external circuit elements as shown below in the figure (a). After the switch (S) is closed at time t = 0, the current (I) as a function of time (t) is shown in the figure (b).

(b) In figure current as a function of time is shown.

From this we can infer that the black box contains –

### Choices

Choice (4) Response

a.

A resistor and a capacitor in series

b.

A resistor and an inductor in series

c.

A resistor and an inductor in parallel

d.

A resistor and a capacitor in parallel

## Question number: 87

Appeared in Year: 2014

MCQ▾

### Question

Two identical metallic square loops L1 and L2 are placed next to each other with their sides parallel on a smooth horizontal table. Loop L1 is fixed and a current which increases as a function of time is passed through it. Then loop L2

### Choices

Choice (4) Response

a.

Remains stationary

b.

Moves towards L1

c.

Rotates about its center of mass

d.

Moves away from L1