10th Class Physics Full Book Paper

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

1. To avoid thermal noise, qubits are cooled to within a few thousandths of a degree of:
   1. 0°C
   2. 100°C
   3. Absolute zero
   4. Boiling point of water
2. Electricity ensures our devices remain functional by:
   1. Cooking food
   2. Recharging batteries
   3. Cooling the environment
   4. Producing light
3. Infrasonic waves have frequency.
   1. greater than 20 Hz
   2. less than 20 Hz
   3. of 20 Hz
   4. of 20 kHz
4. The center point through which the principal axis passes in a lens is called:
   1. Focal point
   2. Optical center
   3. Curvature center
   4. Normal
5. The natural emission of radiations from unstable nuclei is called:
   1. Fusion
   2. Fission
   3. Radioactivity
   4. Ionization
6. If the same amount of heat energy is supplied to equal masses of water and copper, why does the temperature of copper increase faster?
   1. Copper has a lower specific heat capacity
   2. Water is a poor conductor of heat
   3. Convection in water dissipates heat energy quickly
   4. Radiation from water is stronger
7. The process used in photocopiers is called:
   1. Polarization
   2. Xerography
   3. Magnetography
   4. Ionization
8. Wave equation is given by:
   1. v = f × λ
   2. v = λ / T
   3. v = f / λ
   4. v = T × λ
9. The usual range of ammeters for home appliances is:
   1. 1 A to 10 A
   2. 1 A to 100 A
   3. 100 A to 500 A
   4. Less than 1 A
10. When ice melts, the energy supplied:
    1. Raises the temperature of ice
    2. Breaks intermolecular forces without raising temperature
    3. Increases density only
    4. None of these
11. The induced current generated according to Lenz’s law always:
    1. Supports the motion of the magnet
    2. Opposes the motion of the magnet
    3. Stops the magnet
    4. Moves randomly
12. The phenomenon of blue sky and red sky is explained by:
    1. Dispersion of light
    2. Polarization of light
    3. Scattering of light
    4. Reflection of light