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Learn CIVIL SERVICES MCQs with answers [Page 15 of Department 33]

141) Which one of the following is not the effect of the revolution of the Earth.

(A) Change of seasons

(B) Length of days and nights

(D) Change in the direction of winds and ocean currents

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Correct Answer - Option (D)

Explanation :
Our planet's rotation produces a force on all bodies moving relative to the Earth. Due to Earth's approximately spherical shape, this force is greatest at the poles and least at the Equator. The force, called the "Coriolis effect," causes the direction of winds and ocean currents to be deflected.

142) At 12 noon of December 21, you observe that you cast no shadow as you stand in bright sunlight. So you must be, somewhere near ________

(A) The Arctic Circle

(B) The Tropic of Cancer

(D) The South Pole

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Correct Answer - Option (C)

Explanation :
At 12 noon of December 21, you observe that you cast no shadow as you stand in bright sunlight. So you must be, somewhere near The Tropic of Capricorn. The Tropic of Capricorn is the circle marking the latitude 23.5° south where the sun is directly overhead at noon on December 21, the beginning of winter in the northern hemisphere.

143) The revelations of a satellite photograph of the earth are as follows:
1. the Southern hemisphere bulges slightly more than the Northern hemisphere
2. it is slightly pear shaped ellipsoid of rotation
3. the polar axis of the earth is slightly shorter than the equatorial axis
4. the equatorial circumference is about 40,000km
Which of the above statements are correct ?

(A) 1, 2 and 3

(B) 1, 2, 3 and 4

(D) 2, 3 and 4

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Correct Answer - Option (D)

No Explanation found. Add Explanation and get +2 points.

144) Tides in the sea have stored in them ________

(A) Hydraulic energy

(B) Kinetic energy

(D) A combination of all the above three forms of energy

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Correct Answer - Option (D)

Explanation :
Tides in the sea have stored in them a combination of all the above three forms of energy.

145) Natural radioactivity was discovered by

(A) Marie Curie

(B) Ernest Rutherfor

(D) Enrico Fermi

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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

146) Planets are

(A) luminous heavenly bodies revolving around a star

(B) non-luminous heavenly bodies

(D) luminous heavenly bodies that do not twinkle

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Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

147) Mica is used in electrical appliances such as electric iron because mica is

(A) a good conductor of heat but a bad conductor of electricity

(B) a bad conductor of heat but a good conductor of electricity

(D) a bad conductor of heat as well as electricity

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Correct Answer - Option (A)

Explanation :
Mica is used in electrical appliances such as electric iron because mica is a good conductor of heat but a bad conductor of electricity.

148) It is easier to roll a barrel full of coal tar than to pull it because

(A) the full weight of the barrel comes into play when it is pulled

(B) the rolling friction is much less than the sliding friction

(D) coal tar is a liquid and it flows in the barrel when it is rolled

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Correct Answer - Option (B)

Explanation :
When a body slides (moves with all its surface area in contact) over another body, the resistance faced is due to sliding friction. Hence rolling friction is less than the sliding friction. Thus it is easier to roll a barrel full of coal tar than to pull it.

149) Intensity of sound has

(A) an object existence

(B) a subject existence

(D) both subjective and objective existence

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Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

150) Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from

(A) east

(B) west

(D) southeast

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Correct Answer - Option (A)

Explanation :
With vertical, the relative velocity will be inclined and appear to be coming from east.So the rain will appear to be coming from east.

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