Work, Energy and Power-Conservative and Non-Conservative Forces (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 1 - 2 of 2

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Question number: 1

» Work, Energy and Power » Conservative and Non-Conservative Forces

Appeared in Year: 2014

MCQ▾

Question

A 1.5 kW (kilo-watt) laser beam of wavelength 6400 Å is used to levitate a thin aluminum disc of same area as the cross-section of the beam. The laser light is reflected by the aluminum disc without any absorption. The mass of the foil is close to

Choices

Choice (4) Response

a.

104kg

b.

106kg

c.

103kg

d.

109kg

Question number: 2

» Work, Energy and Power » Conservative and Non-Conservative Forces

Appeared in Year: 2015

MCQ▾

Question

Two small metal balls of different mass m1 and m2 are connected by strings of equal length to fixed point. When the balls are given charges, the angles that the two strings make with the vertical are 300 and 600, respectively. The ratio m1m2 is close to –

Choices

Choice (4) Response

a.

3.0

b.

1.7

c.

0.58

d.

2.0

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