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Physical Science |
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| 281)The pole star does not seem to move because | |||
| it moves around the sun and not the earth | it is in line with the earth's axis of rotation | ||
| its movement can be seen only during solar eclipse | it rotates very rapidly | ||
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| 282)Which of the following do not belong to the solar system | |||
| planets | asteriods | ||
| nebulae | comets | ||
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| 283)Which planet has prominent rings around it | |||
| Uranus | Mars | ||
| Saturn | Jupitar | ||
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| 284)The heaviest among the inner planets is the | |||
| Mercury | Mars | ||
| Venus | Earth | ||
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| 285)Which planets do not have satelites revolving around them? | |||
| Mercury and Venus | Mars and Mercury | ||
| Neptune and Saturn | Mars and Venus | ||
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| 286)Which planet has the maximum number of satellites? | |||
| Uranus | Jupitar | ||
| Saturn | Mars | ||
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| 287)The tail of a comet always points away from the sun due to | |||
| centrifugal force | force of repulsion | ||
| solar radiation and solar wind | none of these | ||
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| 288)Which comet was seen in 1910 and again in 1986 | |||
| Great comet | Holme's comet | ||
| Kohoutek comet | Halley's comet | ||
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| 289)We see only one side of the moon all the time because | |||
| the speed of rotation of the moon is very high | the period of rotation of the moon on its axis is equal to the period of revolution around the earth | ||
| the period of revolution of the moon around the earth is same as that of the earth around the sun | the moon does not rotate on its axis | ||
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| 290)What is the source of electric energy in an artificial satellite? | |||
| a dynamo | a thermopile | ||
| solar cells | a mini nuclear reactor | ||
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| 291)Treads on the shoe soles are made to | |||
| dcerease friction | increase durability | ||
| increase friction | increase strength | ||
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| 292)Broad wooden sleepers are places below the rails to | |||
| hold the rails parallel | reduce pressure exerted by the train | ||
| fix the fish plates properly | act as shock absorber | ||
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| 293)An artificial satellite can be tracked very precisely from the earth by sung | |||
| sonar | rader | ||
| Zeeman effect | Doppler effect | ||
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| 294)The sun is | |||
| medium-sized star | small star | ||
| a big star | not a star | ||
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| 295)Heavenly matter landing on the earth's surface is known as | |||
| shooting star | meteor | ||
| meteorite | UFO | ||
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