KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 23 - 25 of 250

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Question number: 23

» Electrostatics » Gauss's Law

Appeared in Year: 2010

MCQ▾

Question

A charge + q is placed somewhere inside the cavity of a thick conducting spherical shell of inner radius R1 and outer radius R2. A charge –Q is placed at a distance r > R2 from the centre of the shell. Then the electric field in the hollow cavity –

Choices

Choice (4) Response

a.

depends on both + q and –Q

b.

is zero

c.

is only that due to –Q

d.

is only that due to + q

Question number: 24

» Work, Energy and Power » Work-Energy Theorem

Appeared in Year: 2011

MCQ▾

Question

Two plates each of the mass m are connected by a massless spring as shown.

 Two plates connected by spring

Two Plates Connected by Spring

In figure two plates each of the mass m are connected by a massless spring as shown.

A weight W is put on the upper plate which compresses the spring further. When W is removed, the entire assembly jumps up. The minimum weight W needed for the assembly to jump up when the weight is removed is just more than –

Choices

Choice (4) Response

a.

2mg

b.

4mg

c.

mg

d.

3mg

Question number: 25

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

Appeared in Year: 2011

MCQ▾

Question

For a domestic AC supply of 220 V at 50 cycles per second, the potential difference between the terminals of a two pin electric outlet in a room is given by –

Choices

Choice (4) Response

a.

V(t)=2202cos(100πt)

b.

V(t)=2202cos(50t)

c.

V(t)=220cos(50t)

d.

V(t)=220cos(100πt)

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