PHY101 Final Term Preparation by Brainy Squad

PHY101 FINAL TERM PREPARATION

BY BRAINY SQUAD 100+ MCQ

Q1. How fast should you move away from a 6.0×1014 Hz6.0 \times 10^{14} \, \text{Hz}6.0×1014Hz light source to observe waves with a frequency of 4.0×1014 Hz4.0 \times 10^{14} \, \text{Hz}4.0×1014Hz?

1. 0.20c
2. 0.38c
3. 0.45c
4. 0.51c

Correct answer: 0.51c

E. 0.76c

Q2. The units of the electric field are:

1. J/(C·m)
2. J/C
3. J·C
4. J/m

Q3. If two light waves are coherent:

1. their amplitudes are the same
2. their frequencies are the same
3. their wavelengths are the same
4. their phase difference is constant

Correct answer: their frequencies are the same

Q4. A 60-watt light bulb carries a current of 0.5 A. The total charge passing through it in one hour is:

1. 120 C
2. 3600 C
3. 3000 C
4. 2400 C

Correct answer: 3000 C

E. 1800 C

Q5. If the charge on a parallel-plate capacitor is doubled:

1. the capacitance is halved
2. the capacitance is doubled
3. the electric field is halved
4. the electric field is doubled

Correct answer: the electric field is doubled

Q6. When an object (iron/tungsten) is heated, it emits light. It emits infrared (IR) light when it is heated at a temperature

• Below 800 degree C

• Between 800 degree C to 1600 degree C

• Between 1600 degree C to 2500 degree C
• Above 2500 degree C

Q7. The reason there are two slits, rather than one, in a Young’s experiment is:

• To create a path length difference

• To increase the intensity
• One slit is for frequency, the other for wavelength
• One slit is for Electric fields, the other is for Magnetic fields

Q8. An electron is moving at 0.6c. If we calculate its kinetic energy using (1/2)mv2(1/2) mv^2(1/2)mv2, we get a result that is:

• Just right
• Just half enough
• Twice the correct value

• About 28% too low

Q9. During a slow adiabatic expansion of a gas:

• The pressure remains constant
• Energy is added as heat
• Work is done on the gas

• No energy enters or leaves as heat

Q10. The theoretical upper limit for the frequency of electromagnetic waves is:

• Just slightly greater than that of red light

• There is no upper limit

Q11. One revolution is the same as:

• 1 rad
• 57 rad
• π/2 rad
• π rad

• 2π rad

Q12. For a body to be in equilibrium under the combined action of several forces:

• All of the forces form pairs of equal and opposite forces

• All the forces must be applied at the same point
• Any two of these forces must be balanced by a third force

Q13. Capacitors C1C_1C1 and C2C_2C2 are connected in series. The equivalent capacitance is given by:

• C1C2/(C1+C2)C_1C_2 / (C_1 + C_2)C1C2/(C1+C2)

• (C1+C2)/C1C2(C_1 + C_2) / C_1C_2(C1+C2)/C1C2
• 1/(C1+C2)1 / (C_1 + C_2)1/(C1+C2)
• C1/C2C_1 / C_2C1/C2

Q14. If the potential difference across a resistor is doubled:

• Only the current is doubled

• Only the current is halved
• Only the resistance is doubled
• Only the resistance is halved

Q15. By using only two resistors, R1R_1R1 and R2R_2R2, a student is able to obtain resistances of 3Ω,4Ω,12Ω,3\Omega, 4\Omega, 12\Omega,3Ω,4Ω,12Ω, and 16Ω16\Omega16Ω. The values of R1R_1R1 and R2R_2R2 (in ohms) are:

• 3,43, 43,4
• 2,122, 122,12

• 4,124, 124,12

• 3,163, 163,16

Q16. Faraday's law states that an induced emf is proportional to:

• The rate of change of the electric field

• The rate of change of the magnetic flux

• The rate of change of the electric flux
• The rate of change of the magnetic field

17. Read the statement carefully and choose ‘inference’ from the given options. If you go to a Mexican restaurant, you can infer that:

• ► They will not serve tea.
• ► They will have hot dogs on the menu.

• ► They have specialized in Mexican food. (Correct Answer)

• ► They will have the best food in the town.