Work, Energy and Power (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 1 - 3 of 21

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Question number: 1

» 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: 2

» Work, Energy and Power » Conservation of Mechanical Energy

Appeared in Year: 2010

MCQ▾

Question

Two identical particles of mass ‘m’ and charge q are shot at each other from a very great distance with an initial speed v. The distance of closest approach of these charges is –

Choices

Choice (4) Response

a.

0

b.

q24πε0mv2

c.

q22πε0mv2

d.

q28πε0mv2

Question number: 3

» Work, Energy and Power » Work-Energy Theorem

Appeared in Year: 2012

MCQ▾

Question

In one model of the election, the mass of electron me is thought to be a uniformly charged shell of radius R and total charge e, whose electrostatic energy E is equivalent to its mass me via Einstein’s mass energy relation E = mec2. In this model, R is approximately – (me = 9.1 × 10-31kg, c = 3 × 108 ms-1, 14πϵ0=9×109Faradsm1, magnitude of the electron charge = 1.6 × 10-19 C)

Choices

Choice (4) Response

a.

1.4×1015m

b.

2.8×1035m

c.

2×1013m

d.

5.3×1011m

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