Physics-
General
Easy
Question
A body rotates at 300 rotations per minute. The value in radian of the angle described in 1 sec is-
- 5
- 5
- 10
- 10
The correct answer is: 10
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A wheel starts rotating from rest and attains an angular velocity of 60 rad/sec in 5 seconds. The total angular displacement in radians will be-
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The moment of inertia of a body is I and its coefficient of linear expansion is if temperature of body rises by a small amount T. Then change in moment of inertia about the same axis –
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Two loops P and Q are made from a uniform wire. The radii of P and Q are r1 and r2 respectively, and their moments of inertia are I1 and I2 respectively. If I2 = 4I1 , then 
equals –
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A particle performs uniform circular motion with angular momentum 'L'. If the frequency of particles motion is halved and its KE is doubled then the angular momentum becomes –
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What must be the relation between length 'L' and radius 'R' of the cylinder if its moment of inertia about its axis is equal to that about the equatorial axis ?
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A solid sphere of mass M and radius R is placed on a smooth horizontal surface. It is given a horizontal impulse J at a height h above the centre of mass and sphere starts rolling then, the value of h and speed of centre of mass are –
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A square plate is kept in yz-plane. Then according to perpendicular axis theorem -
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A sphere of radius 'R' is rolling over a horizontal surface. All measurement are made with respect to surface over which sphere is rolling. Which of the following strictly confirms pure rolling motion of sphere over horizontal surface ?
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One end of a uniform rod of length l and mass m is hinged at A. It is released from rest from horizontal position AB as shown in figure. The force exerted by the rod on the hinge when it becomes vertical is -
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When a circular coil of radius 1 m and 100 turns is rotated in a horizontal uniform magnetic field, the peak value of emf induced is 100 V. the coil is unwound and then rewound into a circular coil of radius 2 m. If it is rotated now, with the same speed, under similar conditions, the new peak value of emf developed is
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. Self-inductance of the coil is
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A step down transformer, transforms a supply line voltage of 2200 V into 220 V. The primary coil has 5000turns. The efficiency and power transmitted by the transformer are 90% and 8 kW respectively. Then the power supplied is
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