NEET Physics: 10 Essential Questions (PART 5) 📚

NEET Physics Quiz

1. What is the SI unit of electric flux?

A. Volt-meter
B. Joule-meter
C. Newton/Coulomb
D. Volt/meter

Correct answer: A. Electric flux (φE) = E × A, unit = (V/m) × m² = V·m.

2. A geostationary satellite orbits at a fixed height above the Earth's surface. What is its orbital period?

A. 12 hours
B. 24 hours
C. 36 hours
D. 72 hours

Correct answer: B. Geostationary satellites match Earth's rotation, 24 hours.

3. The photoelectric effect is the emission of electrons from a metal when it is exposed to:

A. Heat
B. Light
C. Electric field
D. Magnetic field

Correct answer: B. Light photons transfer energy to electrons, ejecting them.

4. A car starts from rest and accelerates at a constant rate of 2 m/s². What will be its velocity after 10 seconds?

A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s

Correct answer: B. v = u + at = 0 + (2 × 10) = 20 m/s.

5. The force between two parallel current-carrying wires is:

A. Attractive if currents are in same direction
B. Repulsive if currents are in same direction
C. Always attractive
D. Always repulsive

Correct answer: A. Same direction currents → attractive force; opposite → repulsive.

6. If the radius of a nucleus is doubled, its volume will be:

A. Doubled
B. Halved
C. Quadrupled
D. Eight times

Correct answer: D. Volume ∝ r³; doubling r → 8× volume.

7. Which of the following is NOT a property of electromagnetic waves?

A. They are transverse waves.
B. They travel at speed of light in vacuum.
C. They require a medium to propagate.
D. They have oscillating E & M fields.

Correct answer: C. EM waves propagate even in vacuum.

8. The magnifying power of a telescope is given by:

A. fₒ × fₑ
B. fₒ / fₑ
C. fₑ / fₒ
D. fₒ + fₑ

Correct answer: B. MP = focal length of objective ÷ focal length of eyepiece.

9. What is the main function of a rectifier?

A. Increase AC voltage
B. Decrease AC voltage
C. Convert AC to DC
D. Convert DC to AC

Correct answer: C. Rectifiers allow current in one direction, making DC.

10. A body is thrown with a velocity of 20 m/s at an angle of 30° to the horizontal. What is its horizontal range? (g = 10 m/s², sin 60° = √3/2)

A. 20√3 m
B. 40√3 m
C. 30√3 m
D. 50√3 m

Correct answer: A. R = (u² sin 2θ)/g = (400 × √3/2)/10 = 20√3 m.