Physic Quiz Part 1

1. A closed organ pipe and an open organ pipe have their first overtone identical in frequency. Their lengths are in the ratio of:

a. 1:1
b. 1:2
c. 2:1
d. 3:4

2. The unit of coefficient of viscosity is:

a. N/(m²s⁻¹)
b. Nm²s⁻¹
c. Nm²/s
d. Nm²/s²

3. In a double slit experiment, the fringe width will be maximum for:

a. Violet
b. Red
c. Green
d. Yellow

4. A balloon of weight 300N is moving upward. The volume of the balloon is 30 m³ and it displaces air of density 1.2 kg/m³. The force that carries the balloon upward is:

a. 360N
b. 60N
c. 230N
d. 400N

5. The relation of escape velocity with orbital velocity is given by:

a. vₑ = vₒ
b. vₑ = 2vₒ
c. vₑ = vₒ/√2
d. vₑ = √2vₒ

6. The X-ray tube is operated at 50kV. The minimum wavelength is approximately:

a. 0.5 Å
b. 0.25 Å
c. 10 Å
d. None

7. A capacitor of capacitance 1 µF is connected in an alternating circuit of frequency 50 Hz. The capacitive reactance is:

a. 100 Ω
b. 50 Ω
c. 1 Ω
d. 10⁴ Ω

8. The half-life of a radioactive substance is 30 days. The time taken for ¾ of the original mass to disintegrate is:

a. 15 days
b. 30 days
c. 45 days
d. 60 days

9. The moment of inertia of a solid sphere of mass M and radius R about its diameter is:

a. (2/5)MR²
b. (1/2)MR²
c. (2/3)MR²
d. (3/5)MR²

10. A diatomic ideal gas does 100 J of work when it is expanded isothermally. The amount of heat added to the gas is:

a. 50 J
b. 100 J
c. 150 J
d. 200 J