A wheel of mass 10 kg has a moment of inertia of 10 kgm² about its own axis
A wheel of mass 10 kg has a moment of inertia of 10 kgm² about its own axis. The radius of gyration will be
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(a) 10 m (b) 8 m (c) 6 […]
Questions
Radius of first orbit of the electron in a hydrogen atom is 0.53 Å. So the radius
Radius of first orbit of the electron in a hydrogen atom is 0.53 Å. So the radius of the third orbit will be
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(a) 1.12 Å (b) 4.77 Å (c) 1.06 Å […]
Three fourth of the active material decays in a radioactive sample in 3/4 sec
Three fourth of the active material decays in a radioactive sample in 3/4 sec. The half life of the sample is
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(a) 1/2 sec (b) 1 sec (c) 3/8 sec (d) 3/4 […]
An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min
An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. The torque that it delivers is
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(a) 350 Nm (b) 440 Nm (c) 531 Nm (d) 628 Nm
When a spring is extended by 2 cm energy stored is 100 J. When extended further by 2 cm
When a spring is extended by 2 cm energy stored is 100 J. When extended further by 2 cm, the energy increases by
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(a) 300 J (b) 400 J (c) 200 J (d) […]
In refraction, light waves are bent on passing from one medium to the second medium
In refraction, light waves are bent on passing from one medium to the second medium, because in the second medium
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(a) the frequency is different (b) coefficient of elasticity is different (c) […]
A body weighs 50 grams in air and 40 grams in water. How much would it weigh in a liquid
A body weighs 50 grams in air and 40 grams in water. How much would it weigh in a liquid of specific gravity 1.5?
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(a) 65 grams (b) 45 grams (c) 30 […]
Two balls are dropped from heights h and 2h respectively. The ratio of times
Two balls are dropped from heights h and 2h respectively. The ratio of times of these balls to reach the earth is
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(a) 1 : √2 (b) √2 : 1 (c) 2 […]
A coil of resistance 20 ohm and inductance 5H is connected with a 100V battery
A coil of resistance 20 ohm and inductance 5H is connected with a 100 V battery. Energy stored in the coil will be
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(a) 62.5 J (b) 41.5 J (c) 125 J […]
A person cannot see the objects clearly placed at a distance more than 40 cm
A person cannot see the objects clearly placed at a distance more than 40 cm. He is advised to use a lens of power
Options
(a) -2.5 D (b) 2.5 D (c) -6.25 […]