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23rd August 2014, 11:30 AM
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Join Date: Apr 2013
Re: IIT-JEE Physics Question Paper

Below few questions of IIT-JEE Physics exam are given.
A sonometer wire of length 1.5m is made ofsteel. The tension in it produces an elastic strain of 1%. What is the fundamental frequency of steel if density and elasticity of steel are 7.7 × 103 kg/m3 and 2.2 × 1011 N/m2 respectively ?
(1) 188.5 Hz
(2) 178.2 Hz
(3) 200.5 Hz
(4) 770 Hz
Ans. (2)

The amplitude of a damped oscillator decreases to 0.9 times its original magnitude in 5s. In another 10s it will decrease to times its original magnitude, where equals :
(1) 0.7
(2) 0.81
(3) 0.729
(4) 0.6
Ans. (3)

Two capacitors C1 and C2 are charged to 120V and 200V respectively. It is found that by
connecting them together the potential on each one can be made zero. Then :
(1) 5C1 = 3C2
(2) 3C1 = 5C2
(3) 3C1 + 5C2 = 0
(4) 9C1 = 4C2
Ans. (2)

A circular loop of radius 0.3 cm lies parallel to a much bigger circular loop of radius 20 cm. The centre of the small loop is on the axis of the bigger loop. The distance between their centres is 15 cm. If a current of 2.0 A flows through the smaller loop, then the flux linked with bigger loop is :-
(1) 9.1 × 10–11 weber
(2) 6 × 10–11 weber
(3) 3.3 × 10–11 weber
(4) 6.6 × 10–9 weber
Ans. (1)

Diameter of a plano-convex lens is 6cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 × 108 m/s, the focal length of the lens is :
(1) 15 cm
(2) 20 cm
(3) 30 cm
(4) 10 cm
Ans. (3)







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