Physics - Mock Test 44

Question 431

The work done by friction is?

A) positive B) negative C) zero D) none of these

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Question 432

When arrow is released form its bow, its energy is transformed from?

A) heat energy to K.E B) elastic P.E to K.E C) elemical energy to elastic P.E D) K.E to elastic P.E.

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Question 433

When two protons are brought together?

A) Kinetic energy increases B) P.E. between them increases C) P.E. between them decreases D) P.E. between tem does not change

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Question 434

The escape velocity form the earth surface in km S-1 is?

A) 4.2 km S-1 B) 7.5 km S-1 C) 9.5 km S-1 D) 1.1 km S-1

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Question 435

The relation between the escape velocity V esc and orbital speed Vo is given byb?

A) V esc = 1/2Vo B) V esc = ?2 Vo C) V esc = Vo D) V esc = 2Vo

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Question 436

The relation between the escape velocity V esc and orbital speed Vo is given by?

A) V esc = 1/2Vo B) V esc = ?2 Vo C) V esc = Vo D) V esc = 2Vo

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Question 437

The consumption of energy by a 60 watt bulb in 2 sec is?

A) 120 J B) 60 J C) 30 J D) 0.02 J

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Question 438

Work has the dimension as that of same as that of?

A) torque B) angular momentum C) linear momentum D) power

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Question 439

Which of the following is not conservative force?

A) friction B) electric C) gravitational D) magnetic

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Question 440

One mega watt hour is equal to?

A) 36 x 106 J B) 36 x 1012 J C) 36 x 109 J D) 36 x 108 J

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