A particle executing SHM with amplitude of 0.1 m. At a certain instant, when its displacement is 0.02 m, its acceleration is 0.5 m/s². The maximum velocity of particle is (in m/s)
Options
A body has 80 microcoulomb of charge. Number of additional electrons in it will be
Options
(a) 8 x 10⁵ (b) 80 x 10¹⁷ (c) 5 x 10¹⁴ (d) 1.28 x 10¹⁷
Correct […]
The potential energy of a weightless spring compressed by a distance D is proportional to
Options
(a) D (b) D⁰ (c) D² (d) D⁻²
Correct Answer:
D⁻²
Explanation:
No explanation available. Be the […]
A coil of resistance 20 ohm and inductance 5H is connected with a 100 V battery. Energy stored in the coil will be
Options
(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. He is advised to use a lens of power
Options
(a) -2.5 D (b) 2.5 D (c) -6.25 […]
If X=3YZ², find dimensions of Y if X and Z are the dimensions of capacity and magnetic field(induction) respectively
Options
(a) M⁻³L⁻²T⁻⁴A⁻¹ (b) ML⁻² (c) M⁻³L⁻²T⁴A⁴ (d) M⁻³L⁻²T⁸A⁴
Correct Answer:
M⁻³L⁻²T⁸A⁴
Explanation:
No […]
Light from the constellation Virgo is observed to increase in wavelength by 0.4%. With respect to earth the constellation is
Options
(a) moving away with velocity 1.2 x 10⁶ m/s (b) coming closer […]
The escape velocity from the earth is Ve. The escape velocity from a planet whose radius is 4 times and density is 9 times that of earth is
Options
(a) 36 Ve (b) […]
64 drops of mercury, each charged to a potential of 10 V, are combined to form one bigger drop. The potential of this drop will be(Assume all drops are spherical)
Options
(a) 160 […]
Two charges placed in air repel each other by a force of 10⁻⁴ N. When oil is introduced between the charges, the force becomes 2.5 x 10⁻⁵ N. The dielectric constant of oil is
2017 Copyright Doctor Dreams Training Academy