Physics || Quiz || Set 1
1. Newton assumed that sound propagation in a gas takes place under the:
1) Isothermal conditions
2) Adiabatic conditions
3) Isobaric condition
4) Isochoric condition
2. Beats can be heard when the difference in frequency is not more than:
1) 4 Hz
2) 8 Hz
3) 9 Hz
4) 10 Hz
3. The speed of sound is maximum in solids because:
1) Density of solids is greater than liquids & gases.
2) Density of solids is smaller than liquids & gases.
3) Solids have a greater modulus of elasticity.
4) Solids have the least modulus of elasticity.
4. The ratio of the amplitudes of two superposing waves is 3:2. The ratio of the maximum and the minimum intensities of the resultant wave is:
1) 9:4
2) 25:1
3) 13:5
4) 5:1
5. The relation between Celsius and Fahrenheit scale is given by
1) C = 5/9(F + 32)
2) C = 9/5(F – 32)
3) C = 9/5(F + 32)
4) C = 5/9(F – 32)
6. An open system is one in which:
1) Mass does not cross boundaries of the system, though energy may do so
2) Neither mass nor energy crosses the boundaries of the system
3) Both mass nor energy crosses the boundaries of the system
4) Mass crosses the boundary but not the energy
7. Which of the following is the property of a system?
1) Pressure and temperature
2) Internal energy
3) Volume and density
4) All of these
8. Zeroth law of thermodynamics:
1) Deals with the conversion of mass and energy
2) Deals with reversibility and irreversibility of the process
3) States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
4) Deals with heat engines
9. A Carnot engine can be 100% efficient if its sink is at
1) 0 K
2) 0 C
3) 0 F
4) 273 K
10. Sound travels faster in moist air because (at STP):
1) Moist air is heavier than dry air
2) The value of γ of moist air is greater than that of dry air
3) The pressure of moist air is greater than that of dry air
4) The density of moist air is less than that of dry air