Which one of the following parameters of a wave undergoes a change when the wave is reflected from a boundary?
Intensity
Wavelength
Speed
Frequency
A solid spherical ball rolls on an inclined plane without slipping. The ratio of rotational energy and total energy is?
2/5
2/7
3/5
3/7
When mass is rotating in a place about a fixed point, its angular momentum is directed along
The axis of rotation
Line at an angle of 45° to the axis of rotation
The radius
The tangent to the orbit
When mechanical waves have a frequency below the audible range, these are called
Sonics
Infrasonics
Ultrasonics
Supersonics
By inserting a capillary tube up to a depth l in water, the water rises to a height h. if the lower end of the capillary is closed inside water and the capillary is taken out and closed end opened, to wheat height the water will remain in the tube? Here l > h.
Zero
L + H
2h
h
When we walk one ice, we should take small steps to avoid slipping. This is because smaller steps ensure
Larger friction
Smaller friction
Larger normal force
Smaller normal force
A particle is projected with 200 ms-1 at an angle 60°. At the highest point, it explodes into three particles of equal masses. One goes vertically upward with velocity 100 ms-1, second particle goes vertically downward. Then what is the velocity of the third one?
120 ms-1 with 60° angle
200 ms-1 with 30° angle
300 ms-1
200 ms-1
The resultant of two equal forces is double of either of the force. The angle between them is
00
600
900
1200
The swing of a spinning cricket ball in the air can be explained on the basis of
Sudden change in wind direction
Buoyancy of force
Turbulence caused by wind
Bernoulli’s theorem
The tail of a comet always point away from the sun due to the
Force of repulsion between the charged particles of its gases
Gravitational force exerted by the sun on its gases
Pressure exerted by the light of the sun on its gases
Centrifugal force on its rotating gases