A force of 5 N is acting on an object. Displacement of object is 10 m and the work done
A force of 5 N is acting on an object. Displacement of object is 10 m and the work done on it is 25 J. The angle between force and displacement is
Options
Physics
A body is moving in a vertical circle. The string must remain taut at the highest point
A body is moving in a vertical circle. The string must remain taut at the highest point. The centripetal acceleration when string is horizontal is
Options
(a) 3g (b) 5g (c) g (d) […]
A transistor is working in common emitter mode. Its amplification factor is 80
A transistor is working in common emitter mode. Its amplification factor is 80. If the base current is 250 µA, what is the current at the collector?
Options
(a) 250 µA (b) 250 […]
Water rises to a height h in a capillary at the surface of earth. On the surface
Water rises to a height h in a capillary at the surface of earth. On the surface of the moon the height of water column in the same capillary will be
Options
(a) […]
A Galilean telescope has an objective of focal length 100 cm and magnifying power 50
A Galilean telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal adjustment will be
Options
(a) 96 cm (b) 98 cm […]
Starting from the origin, a body oscillates simple harmonically with a period of 2s
Starting from the origin, a body oscillates simple harmonically with a period of 2s. After what time will its kinetic energy by 75% of the total energy?
Options
(a) 1/12 sec (b) 1/6 […]
The potential difference applied to an X-ray tube is 5 kV and the current through it
The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. The number of electrons striking the target per second is
Options
(a) 5 x 10¹⁶ […]
The mean distance between the atoms of iron is 3 x 10⁻¹⁰ m and interatomic force
The mean distance between the atoms of iron is 3 x 10⁻¹⁰ m and interatomic force constant for iron is 7 N/m. The Young’s modulus of elasticity for iron is
Options
(a) 2.33 […]
An unpolarised beam of intensity I is incident on a pair of nicols making an angle
An unpolarised beam of intensity I is incident on a pair of nicols making an angle of 60° with each other. The intensity of light emerging from the pair is
Options
(a) I […]
A magnetic field of 1600 A/m produces a magnetic flux of 2.4 x 10⁻⁵ Wb
A magnetic field of 1600 A/m produces a magnetic flux of 2.4 x 10⁻⁵ Wb in an iron bar of cross-sectional area 0.2 cm². The susceptibility of the iron bar is
Options
(a) […]