KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 178 - 181 of 250

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Question number: 178

» Laws of Motion » Equilibrium of Concurrent Forces

MCQ▾

Question

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

A girder supporting a load

A Girder Supporting a Load

In figure a girder supporting a load of 20, 000 N. F is the compression forces.

Choices

Choice (4) Response
a.

150003

b.

7500

c.

75003

d.

75003

Question number: 179

» Atoms and Nuclei » Half Life and Mean Life

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

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

Appeared in Year: 2015

MCQ▾

Question

A point charge Q (=3×1012C) 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.

1011rads

b.

107rads

c.

1013rads

d.

109rads

Question number: 181

» Properties of Solids & Liquids » Temperature

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.

t1=t2=t3

b.

t1>t2>t3

c.

t1<t2<t3

d. Question does not provide sufficient data or is vague

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