Engineering Physics I Mock Test 5

10%

Question 1 of 10

1. Temperatures of two stars are in ratio 3:2. If wavelength of maximum intensity of first body is 4000 Å, what is corresponding wavelength of second body?

9000 Å

8000 Å

6000 Å

2000 Å

Question 1 of 10

Question 2 of 10

2. If the amount of heat given to a system is 35 J and the amount of work done by the system is -15J and the amount of work done by the system is -15J, then the change in the internal energy of the system is?

20J

-50J

50J

Question 2 of 10

Question 3 of 10

3. It is possible that the temperature of the body changes even without giving heat to it or taking heat from it.

False

True

Question 3 of 10

Question 4 of 10

4. Assertion: The temperature of a gas does not change, when it undergoes an adiabatic expansion.
Reason: During an adiabatic process, heat energy is exchanged between a system and its surrounding.

Both assertion and reason are true but the reason is not a correct explanation of the assertion

Both assertion and reason are true and the reason is the correct explanation of the assertion

Both assertion and reason are false

Assertion is true but the reason is false

Question 4 of 10

Question 5 of 10

5. What is the average velocity of the molecules of an ideal gas?

Constant

Infinity

Zero

Unstable

Question 5 of 10

Question 6 of 10

6. The temperature of H₂ at which the rms velocity of its molecules is seven times the rms velocity of the molecules of nitrogen at 300K is?

1350K

1050K

2100K

1700K

Question 6 of 10

Question 7 of 10

7. The Wien’s displacement law expresses a relation between ___________

Wavelength corresponding to maximum energy and absolute temperature

Colour of light and emissive power

Temperature and emissive power

Radiated energy and wavelength

Question 7 of 10

Question 8 of 10

8. Assertion: In a pressure cooker the water is about to be boiled. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water boils again.
Reason: The impurities in water bring down its boiling point.

Both assertion and reason are true and the reason is the correct explanation of the assertion

Assertion is true but the reason is false

Both assertion and reason are true but the reason is not a correct explanation of the assertion

Both assertion and reason are false

Question 8 of 10

Question 9 of 10

9. Assertion: Reversible systems are difficult to find in the real world.
Reason: Most process is dissipative in nature.

Both assertion and reason are true but the reason is not a correct explanation of the assertion

Both assertion and reason are false

Both assertion and reason are true and the reason is the correct explanation of the assertion

Assertion is true but the reason is false

Question 9 of 10

Question 10 of 10

10. The escape velocity of a projectile from the earth is approximately ___________

1.1km/sec

11.2km.sec

7km/sec

112km/sec

Question 10 of 10