Force required to move a mass of 1kg at rest on a horizontal rough plane
Force required to move a mass of 1kg at rest on a horizontal rough plane (μ = 0.1 and g = 9.8 m/s²) is
Options
(a) 0.98 N (b) 0.49 N (c) 9.8 […]
WB2008
The distance travelled by an object along a straight line in time t is given by
The distance travelled by an object along a straight line in time t is given by s=3-4t+5t², the initial velocity of the object is
Options
(a) 3 unit (b) -3 unit (c) 4 […]
A battery of e.m.f. E and internal resistance r is connected to an external resistance
A battery of e.m.f. E and internal resistance r is connected to an external resistance R the condition for maximum power transfer is
Options
(a) rR (c) r=1/R (d) r=R
Correct Answer:
r=R
A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms⁻¹.
A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms⁻¹. Assuming constant acceleration, the approximate time that it spends in the barrel after the gun is fired is
A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle
A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle of radius 1 m the centrifugal force is
Options
(a) 0.1 dyne (b) 1 dyne […]
If the earth shrink such that its mass does not change but radius decreases to one
If the earth shrink such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take
Options
(a) 96 hours (b) 48 […]
A body of mass 3 kg acted upon by a constant force is displaced by S meter
A body of mass 3 kg acted upon by a constant force is displaced by S meter, given by relation S=1/3t², where t is in second. Work done by the force in2 seconds
Options […]
The ionisation potential of hydrogen-atom is -13.6 eV. An electron in the groundstate
The ionisation potential of hydrogen-atom is -13.6 eV. An electron in the groundstate of a hydrogen-atom absorbs a photon of energy 12.75 eV. How many different spectral lines can one expect when the electron make […]
64 identical spheres of charge q and capacitance C each are combined to form a large
64 identical spheres of charge q and capacitance C each are combined to form a large sphere. The charge and capacitance of the large sphere is
Options
(a) 64q, C (b) 16q, 4C (c) […]
When sound is produced in an aeroplane with a velocity of 200 m/s horizontally,
When sound is produced in an aeroplane with a velocity of 200 m/s horizontally, its echo is heard after 10√5 seconds. If velocity of sound in air is 300 ms⁻¹ the elevation of aircraft is […]