Physics Practice MCQ Page 34
Multiple Choice questions for Physics in the sets of 10 each on one page with questions and answers. All sets are useful in the preparation of subject tests for employment or admission.
Question: 3715 A satellite is orbiting close to the earth. In order to make it move to infinity, its orbital speed is to be increased by
- 20%
- 10%
- 41.4%
- 100%
Question: 3717 Two bars of lead, one twice as heavy as the other, are heated to a temperature of 200°c. The heavy bar
- contains the same amount of heat as the lighter bar
- contains half as much heat as the lighter bar
- contains twice as much heat as the lighter bar
- may contain more or less heat than the lighter bar, depending upon the precise shapes of the bars
Question: 3718 What type of the process is the Carnot's cycle?
- Reversible
- Neither reversible nor irreversible
- Irreversible
- May be reversible or irreversible
Question: 3719 In a mechanical refrigerator, the low temperature coils of the evaporator are at -23°C, and the compressed gas in the condenser has a temperature of 77°C. The coefficient of performance is
- 70 per cent
- 20 per cent
- 0.23
- 2.5
Question: 3722 The law "wave length corresponding to a maximum energy is inversely proportional to the absolute temperature of the black body" is known as
- Wien's law
- Kirchoff's law
- Stefan's law
- Newtons law of cooling
Question: 3723 A given mass of ammonia at 50°C occupies a volume V. To make the volume 2V the temperature must be raised to
- 217 °C
- 373 °C
- 300 °C
- 465 °C
Question: 3724 If the amount of radiant energy received per unit area per second from the sun is measured at the Earth, Mars and Jupiter, it will be
- ine the decreasing order Mars, Earth, Jupiter
- in the increasing order Jupiter, Mars, Earth
- the same at all the three
- none of these
Question: 3726 In the operation of a heat engine heat is at the particular temperature and
- is partly converted into mechanical energy and partly exhausted at the same temperature
- is partly converted into mechanical energy and partly exhausted at a lower temperature
- is completely converted into mechanical energy
- is partly converted into mechanical energy an partly exhausted at a higher temperature
Question: 3727 The temperature at which oxygen molecules will have the same root mean square velocity as that of hydrogen molecules at -100°C is
- 3040°C
- 2768°C
- 2500°C
- 2495°C
Question: 3728 The internal energy of a monoatomic gas is
- 3/2 RT
- independent of temperature
- int he form of kinetic energy
- in the form of kinetic energy
- partially kinetic and partially potential
Question: 3729 The SI unit of thermal conductivity is
- K cal sec-1 metre-1 K-1
- cal sec-1 metre-1 K-1
- watt metre-1 K-1
- none of these
Question: 3730 A metal pendulum is attached to a clock. The clock keeps correct time at 20°C. At 40 °C, the clock
- gains time
- loses time
- keeps correct time
- none of these
Answers to the questions of Physics on this page
Following list gives the correct choice for the answer of the Physics mcqs.
3715 . C
3717 . C
3718 . A
3719 . D
3722 . A
3723 . B
3724 . B
3726 . B
3727 . D
3728 . C
3729 . C
3730 . B
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MCQ for Practicing Subject Tests