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1. According to Einstein mass-energy relation, one gram of matter is equivalent to cnergy of

1. 9 x 10^13 J
2. 9 x 10^14 J
3. 1 x 10^13 J
4. 6 x 10^13 J

2. If 3.6 gm of a matter is converted completely into energy, the electricity that could be obtained from is shall be:

1. 9 x 10^6 kWh
2. 1 x 10^7 kWh
3. 9 x 10^7 kWh
4. 9 x 10^8 kWh

3. If the speed of light were 2/3 of its present value, the energy released in a given in an atomic explosion

1. decreased by a factor of 2/3
2. decreased by a factor of 4/9
3. decreased by a factor of 5/9
4. decreased by a factor of 1/3

4. The sun radiates energy at the rate of 3.6 x 10^33 ergs/sec. This is equivalent to an annihilation of mass at the rate of:

1. 4 x 10^12 g/s
2. 1.3 x 10^23 g/s
3. 4 x 10^4 g/s
4. 4 x 10^10 g/s

5.The mean translational kinetic energy per molecule of an ideal gas is :

1. 3kT/2
2. kT
3. 1kT/2
4. 5kT/2

6. The mass anihilation in a nuclear fusion process is 0.3 percent the energy obtained by anihilation of 1 kg mass will be

1. 2.7x 10^12 J
2. 3.7x 10^12 J
3. 2.7x 10^14 J
4. 2.7x 10^13 J

7. The temperaure at which the root-mean square velocity of hydrogen molecules will be double of its value at NTP, pressure remaining constant is:

1. 273 C
2. 573 K
3. 1029 K
4. 400 K

8. For Van der Waals gas, the critical temperature is:

1. 8a/27Rb
2. 27Rb/8a
3. 27a/8Rb
4. 9a/8Rb

9. According to Maxwell's velcity distribution the most probable speed, mean speed, and RMS speed are related as:

1. most probable sppeed > RMS Speed > average speed
2. average speed > most probable sppeed > RMS Speed
3.RMS Speed > average speed > most probable sppeed
4. RMS Speed + average speed > most probable sppeed

10. An achromatic lens is formed from two thin lenses in contact, having powers of +12 D and - 8 D. The focal length of the combination is:

1. +15 D
2. +20 D
3. +25 D
4. -4 D

11. The magnifying power of an astronomical telescope is 10 and focal length of its eyepiece is 20 cm. The focal length of its objective will be:

1. 200 cm
2. 2 cm
3. 2 m
4. 0.2 cm

12. The dispersive powers of a crown and flint glasses are 0.02 and 0.04 respectively. An achromatic lens of focal length 20 cm is made by keeping two lenses, one of crown glass and the other of flint glass in contact with each other. The focal length of two lenses are:

1. -10 cm, -20 cm
2. 10 cm, 20 cm
3. 10 cm, -20 cm
4. 10 cm, -25 cm

13. A storage battery of e.m.f. 8.0 V and internal resistance 0.5 ohm is charge by 120V d.c. supply using a series resistor 14.5 ohm. The terminal voltage of battery will be:

1. 11.5 V
2. 13V
3. 12.5V
4. 10.5V

14. The internal resistance of an ideal constant voltage source is:

1. 0
2. infinite
3. 1
4. 2

15. An external resistance R is connected to a cell of internal resistance r. The largest ammount of current flow in the external resistance will be:

1. R > r
2. R = r
3. r > R
4. infinite

16. An external resistance R is connected to a battery of e.m.f E and internal resistance r. Power dissipated in external resistance will be maximum if:

1. r > R
2. R = r
3. R > r
4. None of the above

17. The ionization potential of hydrogen atom is 13.6 eV. The enwergy of electronic level, characterised by principal quantum number n = 3 will be:

1. -1.5 eV
2. -4.5 eV
3. -1.8 eV
4. 4.1 eV

18. A 10 henry inductor carries a steady current of 20 amp. The rate of change of current to produce a 100V induced will be:

1. 5 amp/sec.
2. 15 amp/sec.
3. 20 amp/sec.
4. 10 amp sec.

19. Piezo electric effect occurs in:

1. all crystals
2. all solids
3. only in certain type of crystals
4. magnetic materials

20. Electromagnetic waves are produced by:

1. a static charge
2. a moving charge
3. an accelerated charge
4. charge less particles

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