An object of mass 3kg is at rest. Now a force F=6t² i⃗+4t j⃗ is applied on the object
An object of mass 3kg is at rest. Now a force F=6t² i⃗+4t j⃗ is applied on the object. Then velocity of object at t=3s is
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(a) 18 i⃗ + 3 j⃗ […]
Physics
If the red light is replaced by blue light illuminating the object in a microscope
If the red light is replaced by blue light illuminating the object in a microscope, the resolving power of the microscope
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(a) decreases (b) increases (c) gets halved (d) remains unchanged
Correct […]
A boat of anchor is rocked by waves whose crests are 100 m apart and velocity
A boat of anchor is rocked by waves whose crests are 100 m apart and velocity is 25 m/s. The boat bounces up once in every
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(a) 2500 sec (b) 75 sec […]
When the length of the vibrating segment of a sonometer wire is increased by
When the length of the vibrating segment of a sonometer wire is increased by 1%, the percentage change in its frequency is
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(a) 100 / 101 (b) 99 / 100 (c) 1 […]
Sodium and copper have work function 2.3 eV and 4.5 eV respectively
Sodium and copper have work function 2.3 eV and 4.5 eV respectively. The ratio of their threshold wavelengths is nearest to
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(a) 1 : 2 (b) 4 : 1 (c) 2 : […]
The velocity of sound is V, in air. If the density of air is increased to four times
The velocity of sound is V, in air. If the density of air is increased to four times, then the new velocity of sound will be
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(a) V/2 (b) V/12 (c) 12V […]
Light from the constellation Virgo is observed to increase in wavelength by 0.4%
Light from the constellation Virgo is observed to increase in wavelength by 0.4%. With respect to earth the constellation is
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(a) moving away with velocity 1.2 x 10⁶ m/s (b) coming closer […]
Heat is supplied at constant pressure to diatomic gas. The part of this heat that goes
Heat is supplied at constant pressure to diatomic gas. The part of this heat that goes to increase its internal energy will be
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(a) 5 / 7 (b) 3 / 5 (c) […]
Two masses of 9 g and 6 g are connected with a string which is passing over a frictionless
Two masses of 9 g and 6 g are connected with a string which is passing over a frictionless pulley. Then common acceleration is
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(a) 1.96 cm/sec² (b) 48 cm /sec² (c) […]
If a body travels half the distance with velocity v1 and the next half with velocity v2
If a body travels half the distance with velocity v1 and the next half with velocity v2, its average velocity will be given by
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(a) v=√(v1 x v2) (b) v= (v1 + […]