The density of the Sun is: 

(Given, mass of the Sun = 2.0 x 1030 kg and radius of the Sun = 7.0 x 108m)

(1) 2.9 x 103 kg m-3

(2) 1.4 x 103 kg m-3

(3) 5.6 x 103 kg m-3 

(4) 1.9 x 103 kg m-3

Subtopic:  Measurement & Measuring Devices |
 65%
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NEET 2023 - Target Batch - Aryan Raj Singh
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It is claimed that two caesium clocks if allowed to run for 100 years, free from any disturbance, may differ by only about 0.02 sec. What does this imply for the accuracy of the standard caesium clock in measuring a time interval of 1 sec?

1 1012 to 1013
2 107 to 108
3 1010 to 1013
4 1011 to 1012

Subtopic:  Errors |
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NEET 2023 - Target Batch - Aryan Raj Singh
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What will be the average mass density of a sodium atom (assuming its size to be about 2.5 A0)?

1 5.67×103 kg m-3
2 4.67×103 kg m-3
3 4.67×104 kg m-3
4 5.67×104 kg m-3

Subtopic:  Dimensions |
 54%
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A LASER is a source of very intense, monochromatic, and a unidirectional beam of light. These properties of laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon’s surface. How much is the radius of the lunar orbit around the Earth?

(1) 2.14×108 m

(2) 2.84×108 m

(3) 3.84×108 m

(4) 3.14×108 m

Subtopic:  Measurement & Measuring Devices |
 55%
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NEET 2023 - Target Batch - Aryan Raj Singh
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A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects underwater. In a submarine equipped with a SONAR, the time delay between the generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 sec. What is the distance of the enemy submarine? (Speed of sound in water = 1450 m/s )

(1) 60.32 km

(2) 57.70 km

(3) 44.23 km

(4) 55.80 km

Subtopic:  Measurement & Measuring Devices |
 57%
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The farthest objects in our Universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the Earth. These objects (known as quasars) have many puzzling features, which have not yet been satisfactorily explained. What is the distance in km of a quasar from which light takes 3.0 billion years to reach us? 

1 3.2×1022 km
2 3.7×1022 km
3 2.8×1022 km
4 2.1×1022 km

Subtopic:  Measurement & Measuring Devices |
 53%
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The base quantity among the following is 

(1) Speed 

(2) Weight 

(3) Length 

(4) Area 

Subtopic:  Dimensions |
 84%
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Which of the following is not a unit of time?

(1) Second 

(2) minute 

(3) hour 

(4) light year

Subtopic:  Dimensions |
 88%
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One astronomical unit is a distance equal to 

(1) 9.46×1015 m

(2) 1.496×1011 m

(3) 3×108 m

(4) 3.08×1016 m 

Subtopic:  Measurement & Measuring Devices |
 62%
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Ampere second is a unit of 

(1) Current 

(2) Charge 

(3) Energy 

(4) Power 

Subtopic:  Dimensions |
 70%
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