2nd Year Physics Second half Book Paper

Q1. Multiple choice questions (Attempt all · 17 × 1 = 17)

1. The balloon model shows that as the balloon expands:
   1. Dots remain at the same distance
   2. Dots move closer
   3. Dots move farther apart
   4. Dots disappear
2. Which one of the following is an amphoteric oxide?
   1. ZnO
   2. Na₂O
   3. SO₂
   4. B₂O₃
3. Increasing the intensity of incident light of constant frequency above the threshold frequency results in:
   1. Increase in photoelectric current
   2. Increase in kinetic energy of electrons
   3. Both a and b
   4. No change
4. Lithosphere is composed mainly of:
   1. Gases
   2. Rocks and minerals
   3. Ice
   4. Water
5. In a fission reaction, which particle is used to bombard U-235?
   1. Alpha particle
   2. Proton
   3. Neutron
   4. Positron
6. The radiation emitted due to sudden deceleration of electrons is called:
   1. Bremsstrahlung
   2. Larmor radiation
   3. Fluorescence
   4. Synchrotron
7. Another important example of a standard candle is:
   1. Type 1A supernovae
   2. Pulsars
   3. White dwarfs
   4. Black dwarfs
8. Colourless fuming liquid chloride is:
   1. AlCl₃
   2. SiCl₄
   3. S₂Cl₂
   4. PCl₃
9. The energies of whole electrons in photoelectric effect
   1. change with intensity of light
   2. change with velocity of light falling on the metal surface
   3. change with frequency of light
   4. none of the above
10. The Coriolis force equation is:
    1. Fc = 2mνω sinθ
    2. Fc = mgh
    3. Fc = mv²/r
    4. Fc = F/A
11. If N is the number of undecayed nuclei, the activity is given by:
    1. A = λ/N
    2. A = N/λ
    3. A = λN
    4. A = N × T½
12. Normal X-ray films are limited because:
    1. They are 3-D
    2. They only give shadow-like images
    3. They show color
    4. They cannot detect fractures
13. Which law states that brightness of a source is inversely proportional to the square of its distance
    1. Law of brightness
    2. Direct Square Law of brightness
    3. Inverse Square Law of brightness
    4. Inverse Square Law of light
14. The highest oxide of chlorine is:
    1. Cl₂O
    2. ClO₂
    3. HOCl
    4. Cl₂O₇
15. The process of pair production takes place if the energy of photon is
    1. equal to 2mₒc²
    2. less than threshold
    3. greater than 2mₒc²
    4. none of these
16. In the northern hemisphere, Coriolis force deflects moving objects to the:
    1. Left
    2. Right
    3. Upward
    4. Downward
17. Velocity of alpha particles is approximately:
    1. Speed of light
    2. 0.05 – 0.1 c
    3. 0.5 – 0.9 c
    4. 0.001 c