In stretching a spring by 2 cm, energy stored is given by U. Had is been stretched
In stretching a spring by 2 cm, energy stored is given by U. Had is been stretched by 10 cm, energy stored will be
Options
(a) U (b) 25U (c) U/25 (d) 5U
Questions
Two identical flutes produce fundamental notes of frequency 300 Hz at 27° C
Two identical flutes produce fundamental notes of frequency 300 Hz at 27° C. If the temperature of air in one flute is increased to 31° C, the number of beats heard per sec will be […]
If the sodium light in Young’s double slit experiment is replaced by red light
If the sodium light in Young’s double slit experiment is replaced by red light, the fringe width will
Options
(a) decrease (b) increase (c) remain unaffected (d) first increase then decrease
Correct Answer: […]
540 g of ice at 0° C is mixed with 540 g of water at 80° C. The final temperature
540 g of ice at 0° C is mixed with 540 g of water at 80° C. The final temperature of the mixture in °C will be
Options
(a) 40° C (b) 79.9° […]
The radius of the convex surface of a plano-convex lens is 20 cm and the refractive index
The radius of the convex surface of a plano-convex lens is 20 cm and the refractive index of material of the lens is 1.5. The focal length of lens is
Options
(a) 30 […]
A radioactive substance contains 10000 nuclei and its halflife period is 20 days
A radioactive substance contains 10000 nuclei and its halflife period is 20 days. The number of nuclei present at the end of 10 days is
Options
(a) 7070 (b) 9000 (c) 8000 (d) […]
Surface tension of a solution is 30 x 10⁻² N/m. The radius of the soap bubble is 5 cm
Surface tension of a solution is 30 x 10⁻² N/m. The radius of the soap bubble is 5 cm. The surface energy of soap bubble is
Options
(a) 1.8 x 10 J (b) […]
The dimensional formula of Plancks’s constant and angular momentum are
The dimensional formula of Plancks’s constant and angular momentum are
Options
(a) ML²T⁻¹ and MLT⁻¹ (b) ML²T⁻¹ and ML²T⁻¹ (c) MT⁻¹ and MLT⁻¹ (d) ML²T⁻² and ML²T⁻¹
Correct Answer:
ML²T⁻¹ and ML²T⁻¹
Explanation: […]
The displacement of a particle varies according to the relation x=4 (cos π t + sin π t)
The displacement of a particle varies according to the relation x=4 (cos π t + sin π t). The amplitude of the particle is
Options
(a) 8 (b) -4 (c) 4 (d) 4 […]
The total kinetic energy of a body of mass 10 kg and radius 0.5 m moving with a velocity
The total kinetic energy of a body of mass 10 kg and radius 0.5 m moving with a velocity of 2 m/s without slipping is 32.8 J. The radius of gyration of the body is […]