A concave lens of focal length f forms an image which is 1/3 times the size
A concave lens of focal length f forms an image which is 1/3 times the size of the object. Then, the distance of object from the lens is
Options
(a) 2f (b) f (c) […]
Physics
The velocity of image when object and mirror both are moving towards each other
The velocity of image when object and mirror both are moving towards each other with velocities 4 ms⁻¹ and 5 ms⁻¹ respectively, is
Options
(a) (-14ms⁻¹) (b) 15ms⁻¹ (c) (-9ms⁻¹) (d) 14ms⁻¹
Correct Answer: […]
A nucleus disintegrates into two nuclear parts which have their velocities in the ratio
A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2 : 1. The ratio of their nuclear sizes will be
Options
(a) 2¹/³ : 1 (b) 1 : 3¹/² […]
The half-life of a radioactive substance is 30 min. The time (in minutes) taken
The half-life of a radioactive substance is 30 min. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is
Options
(a) 15 (b) 30 (c) 45 […]
Two bodies A and B having temperature 327° C and 427° C are radiating heat
Two bodies A and B having temperature 327° C and 427° C are radiating heat to the surroundings. The surrounding temperature is 27°C. The ratio of rate of heat radiation of A to that of […]
Minimum and maximum values of Poisson’s ratio for a metal lies between
Minimum and maximum values of Poisson’s ratio for a metal lies between
Options
(a) (-∞ to +∞) (b) 0 to 1 (c) (-∞ to 1) (d) 0 to 0.5
Correct Answer:
0 to […]
If angular momentum of a body is increased by 200% its kinetic energy will increase
If angular momentum of a body is increased by 200% its kinetic energy will increase by
Options
(a) 400% (b) 800% (c) 200% (d) 100%
Correct Answer:
800%
Explanation:
No explanation available. Be […]
The acceleration due to gravity at a place is π² m/sec². Then the time period
The acceleration due to gravity at a place is π² m/sec². Then the time period of a simple pendulum of length one metre is
Options
(a) 2/π sec (b) 2π sec (c) 2 […]
A meter stick of mass 400 g is pivoted at one end and displaced through an angle 60°.
A meter stick of mass 400 g is pivoted at one end and displaced through an angle 60°. The increase in its potential energy is
Options
(a) 2 J (b) 3 J (c) […]
Two rigid bodies A and B rotate with rotational kinetic energies Eᴀ and Eʙ
Two rigid bodies A and B rotate with rotational kinetic energies Eᴀ and Eʙ respectively. The moments of inertia of A and B about the axis of rotation are Iᴀ and Iʙ respectively. If Iᴀ […]