The friction of the air causes a vertical retardation equal to 10% of the acceleration due to gravity (take g=10 ms⁻²). The maximum height will be decreased by
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(a) 8% (b) 9% […]
A body moves with a uniform acceleration a and zero initial velocity. Another body B starts from the same point moves in the same direction with a constant velocity v.The two bodies meet after a […]
A particle moves with constant speed v along a circular path of radius r and completes the circle in time T. The acceleration of the particle is
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(a) 2πv/T (b) 2πr/T (c) 2πr²/T […]
A cycle wheel of radius 4 m completes one revolution in two seconds. Then acceleration of cycle will be
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(a) π² ms⁻² (b) 2π² ms⁻² (c) 4π² ms⁻² (d) 8π² ms⁻²
Correct Answer: […]
A current I ampere flows along the inner conductor of a co-axial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance […]
A charged particle experiences magnetic force in the presence of magnetic field. Which of the following statement is correct?
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(a) The particle is moving and magnetic field is perpendicular to the velocity […]
The vector sum of two forces is perpendicular to their vector difference. In that case, the forces
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(a) Are equal to each other in magnitude (b) Are not equal to each other […]
A force of 10 newton acts on a body of mass 20 kg for 10 seconds. Change in its momentum is
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(a) 5 kg. ms⁻¹ (b) 200 kg. ms⁻¹ (c) 100 kg. ms⁻¹ […]
The escape velocity of a body from earth’s surface is Ve. The escape velocity of the same body from a height equal to 7R from earth’s surface will be
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(a) Ve/√2 (b) […]
A satellite in a circular orbit of radius R has a period of 4 hours. Another satellite with orbital radius 3R around the same planet will have a period (in hours)
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(a) […]
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