Wednesday, April 24, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

Physics MCQs of WBCS Prelims Previous Years Questions P16


Page 16

1565151. If the focal length of the objective of an astronomical telescope increases, then its magnifying power will
A
Remain the same
B
Can not be predicted
C
Increase
D
Decrease
C
Correct Answer: C. Increase
1602152. Which of the rays is most dangerous?
A
Gamma-ray
B
X-ray
C
Alpha ray
D
Beta ray
A
Correct Answer: A. Gamma-ray
1560153. A small quantity of water is placed in a small cavity made in a block ice 0°C. What will happen to the water?
A
The temperature of the water will decrease to 0°C but it will not freeze.
B
The water will freeze to ice if the block of ice is large compared to the mass of water.
C
The water will freeze to the ice at 0°C.
D
There will be no change in the temperature of the water
A
Correct Answer: A. The temperature of the water will decrease to 0°C but it will not freeze.
1523154. Optical fiber works on the
A
Scattering
B
Reflection
C
Principle of Refraction
D
Total Internal Reflection
D
Correct Answer: D. Total Internal Reflection
1590155. The closest distance at which a normal person can see an object clearly is
A
80 cm.
B
25 cm.
C
10 cm.
D
50 cm
B
Correct Answer: B. 25 cm.
1553156. Which one of the following is not an electromagnetic wave?
A
Visible light
B
Sound wave
C
Radio wave
D
X-ray
B
Correct Answer: B. Sound wave
1596157. Instruments can be shielded from the effects of external magnetic fields by surrounding them with
A
A brass shield
B
An iron shield
C
A glass shield
D
A rubber shield
B
Correct Answer: B. An iron shield
1520158. The period of rotation of an artificial earth satellite
A
Is inversely proportional to its mass
B
24 hours
C
Depends on its distance from the earth's surface
D
Is proportional to its distance from the earth's center
C
Correct Answer: C. Depends on its distance from the earth's surface
1595159. The primary colors of light are.
A
Yellow, Blue, Red, Grey.
B
Red, Blue, Green
C
Red, Green, Blue, Yellow.
D
None of the above
B
Correct Answer: B. Red, Blue, Green
1592160. The screen of the cinema hall is always white and rough. Because light rays of all colors falling on the screen suffer
A
refraction
B
scattering
C
total absorption
D
total reflection
B
Correct Answer: B. scattering



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