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NAT I Medical Physics MCQs With Answers
Question # 1
A ten-ohm electric heater operates on a 110 V line Calculate the rate at which it develops heat in watts:
Choose an answer
1310 W
670 W
810 W
1210 W
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Question # 2
Huygen's wave theory of light cannot explain
Choose an answer
Diffraction
Interference
Polarization
Photoelectric effect
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Question # 3
Two electric bulbs of 200 W and 100 W have same voltage.If R1 and R2 be their resistance respectively then
Choose an answer
R
1
= 2R
2
R
2
= 2R
1
R
2
= 4R
1
R
1
= 4R
2
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Question # 4
A photocell with a constant p.d of V volt across it illuminated by a point source from a distance of 25 cm. When the source is moved to a distance of 1 m, the electrons emitted by the photocell
Choose an answer
Carry 1/4th their previous energy
Are 1/6th as numerous as before
Are 1/4th as numerous as before
Carry 1/4th their previous momentum
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Question # 5
A 220 V, 50 Hz, AC source is connected to an inductance of 0.2.H and a resistance of 20 ohm in series What is the current in the circuit?
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10 A
5 A
33.3 A
3.33 A
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Question # 6
A cable breaks if stretched by more than 2 mm it is cut into two equal parts how much either part can be stretched without breaking?
Choose an answer
0.25 m
0.5 m
1 mm
2 mm
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Question # 7
The velocity v of a particle at time t is given by:
v = at + b / t + c
The dimensional formula of a,b and c care respectively:
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L
2
; T and LT
2
LT
2
; LT and L
LT
-2
; L and T
L;LT and
T
-2
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Question # 8
In LCR series AC circuit the phase angle between current and voltage is
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Any angle between 0 and ±π/2
π/2
π
Any angle between 0 and π/2
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Question # 9
If two non-zero vector ̅A̅ and ̅B are parallel to each other, then ̅A̅, ̅B is equal to
Choose an answer
Zero
AB
A + B
A - B
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