KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 76 - 79 of 268

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Question number: 76

» Kinematics » Motion in a Plane

Appeared in Year: 2011

MCQ▾

Question

The surface of a planet is found to be uniformly charged. When a particle of mass m and no charge is thrown at an angle from the surface of the planet, it has a parabolic trajectory as in projectile motion with horizontal range L. A particle of mass m and charge q, with the same initial conditions has a range. The range of particle of mass m and charge 2q with the same initial conditions is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 77

» Physics and Measurement » Dimensional Analysis and Its Applications

Appeared in Year: 2012

MCQ▾

Question

The potential energy of a point particle is given by the expression. A dimensionless combination of the constants α, β and γ is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 78

» Current Electricity » Temperature Dependence of Resistance

Appeared in Year: 2012

MCQ▾

Question

A steady current Ι flows through a wire of radius r, length L and resistivity ρ. The current produces heat in the wire. The rate of heat loss in a wire is proportional its surface area. The steady temperature of the wire is independent of

Choices

Choice (4) Response

a.

L

b.

r

c.

I

d.

p

Question number: 79

» Electrostatics » Capacitors

Appeared in Year: 2012

MCQ▾

Question

The capacitor of capacitance C in the circuit shown is fully charged initially, Resistance is R.

Circuit diagram of resistance and capacitor

Circuit Diagram of Resistance and Capacitor

In figure RC circuit diagram is shown.

After the switch S is closed, the time taken to reduce the stored energy in the capacitor to half its initial value is:

Choices

Choice (4) Response

a.

Cln 2

b.

c.

d.

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