Physics MCQS with Answers
A body moves a distance of 10 m along a straight line under the action of a force of 5 Newton’s. If the work done is 25 joules, the angle which the force takes with the direction of motion of the body is:
60°
90°
0°
30°
If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be
10 watt
100 watt
1 watt
0.1 watt
The length of a telescope is 36 cm. The focal lengths of its lenses can be
30 cm, 6 cm
-30cm, 6cm
30 cm, -6cm
-30 cm, -6 cm
In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie
Infrared
Ultraviolet
X-ray
Visible
When a hydrogen atom is bombarded, the atom is excited to the n = 4 state of hydrogen atom. The energy released when the atom falls from n = 4 state to the ground state is
12.75 eV
1.275 eV
5 eV
8 eV
A boy is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about
40 m
160 m
80 m
20 m
A person standing on a rotating platform has his hands lowered. He suddenly outstretches his arms. The angular momentum
Remains the same
Becomes zero
Increases
Decreases
Two forces are acting together on an object. The magnitude of their resultant is minimum when the angle between the force is
120°
180°
60°
0°
A cable that can support a load W is cut into two equal parts. The maximum load that can be supported by either part is:
2W
W/4
W
W/2
In a simple harmonic motion the kinetic energy (KE) and the potential energy (PE), are such that throughout the motion
PE remains constant
KE/PE is constant
KE+PE remains constant
KE remains constant
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