A body is thrown with a velocity of 9.8 m/s making angle of 30° with the horizontal
A body is thrown with a velocity of 9.8 m/s making angle of 30° with the horizontal. It will hit the ground after a time
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(a) 1.5 secs (b) 1 sec (c) […]
Questions
The angular speed of earth, so that the object on equator may appear weightless
The angular speed of earth, so that the object on equator may appear weightless is(g = 10 m/s², radius of earth=6400 km)
Options
(a) 1.25 x 10⁻³ rad/s (b) 1.56 x 10⁻³ rad/s […]
Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100V
Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100 V. The self inductance of the coil is
Options
(a) 0.25 H (b) 0.4 […]
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
Options
(a) 18 i⃗ + 3 j⃗ […]
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
Options
(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
Options
(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
Options
(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
Options
(a) moving away with velocity 1.2 x 10⁶ m/s (b) coming closer […]