40 g of Argon is heated from 40⁰C to 100⁰C (R=2 cal/mole). Heat absorbed at constant volume is
Options
(a) 100 cal (b) 80 cal (c) 180 cal (d) 120 cal
Correct Answer: […]
The coefficient of performance of a Carnot refrigerator working between 30⁰C and 0⁰C is
Options
(a) 10 (b) 1 (c) 9 (d) zero
Correct Answer:
9
Explanation:
Coefficient of performance = K .·. […]
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) […]
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 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 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 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
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 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 of a simple pendulum of length one metre is
Options
(a) 2/π sec (b) 2π sec (c) 2 […]
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