# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 178 - 181 of 268

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## Question number: 178

MCQ▾

### Question

Figure shows a girder supporting a load of 20, 000 N. The compression force F in newton in the girder is –

### Choices

Choice (4) Response

a.

b.

7500

c.

d.

## Question number: 179

Appeared in Year: 2014

MCQ▾

### Question

The half – life of a particle of mass 1.6 × 10–26 kg is 6.9 s and a stream of such particles is travelling with the kinetic energy of a particle being 0.05 eV. The fraction of particles which will decay when they travel a distance of 1 m is –

### Choices

Choice (4) Response

a.

0.1

b.

0.01

c.

0.001

d.

0.0001

## Question number: 180

Appeared in Year: 2015

MCQ▾

### Question

A point charge Q rotates uniformly in a vertical circle of radius R = 1 mm. The axis of the circle is aligned along the magnetic axis of the earth. At what value of the angular speed ω, the effective magnetic field at the centre of the circle will be reduced to zero? (Horizontal component of Earth’s magnetic field is 30 micro Tesla)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 181

MCQ▾

### Question

A body cools from 600 C to 550 C in t1 minutes, from 550 C to 500 C in t2 minutes and from 500 C to 450 C in t3 minutes. Then the relation between t1, t2 and t3 is –

### Choices

Choice (4) Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

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