NEET Physics: 10 Essential Questions (PART 4) 📚

NEET Physics Quiz

1. Which of the following is a unit of magnetic field strength?

A. Weber
B. Henry
C. Tesla
D. Farad

Correct answer: C. The Tesla is the SI unit of magnetic field strength (or magnetic flux density). The Weber is the unit of magnetic flux, the Henry is the unit of inductance, and the Farad is the unit of capacitance.

2. According to the principle of conservation of momentum, if two bodies collide in a closed system, what is conserved?

A. Kinetic energy
B. Total energy
C. Momentum
D. All of the above

Correct answer: C. The law of conservation of momentum states that the total momentum of a closed system remains constant, as long as no external forces act on it.

3. The phenomenon of total internal reflection occurs when light travels from:

A. A denser medium to a rarer medium
B. A rarer medium to a denser medium
C. Any medium to another medium
D. None of the above

Correct answer: A. Total internal reflection occurs when light travels from a medium with a higher refractive index (denser) to one with a lower refractive index (rarer) and the angle of incidence exceeds the critical angle.

4. A car travels at a speed of 60 km/h for the first half of a journey and 120 km/h for the second half. What is the average speed of the car for the entire journey?

A. 80 km/h
B. 90 km/h
C. 100 km/h
D. 120 km/h

Correct answer: A. Using average speed formula, result is 80 km/h.

5. The color of a star is an indicator of its:

A. Distance from Earth
B. Mass
C. Temperature
D. Age

Correct answer: C. A star's color is directly related to its surface temperature.

6. In a series LCR circuit, at resonance, the phase difference between the voltage and current is:

A. 90°
B. 180°
C. 0°
D. 45°

Correct answer: C. At resonance, inductive and capacitive reactances cancel, making voltage and current in phase.

7. A sound wave with a frequency of 20,000 Hz is considered:

A. Infrasonic
B. Ultrasonic
C. Audible
D. Subsonic

Correct answer: B. Sounds above 20 kHz are ultrasonic.

8. What happens to the kinetic energy of a falling body?

A. It increases
B. It decreases
C. It remains constant
D. It becomes zero

Correct answer: A. Potential energy converts to kinetic energy during fall, increasing it.

9. The phenomenon responsible for the twinkling of stars is:

A. Scattering of light
B. Reflection of light
C. Atmospheric refraction of light
D. Dispersion of light

Correct answer: C. Atmospheric refraction causes star twinkling.

10. A nucleus of an atom has a size of the order of:

A. 10^-10 m
B. 10^-15 m
C. 10^-12 m
D. 10^-8 m

Correct answer: B. Nucleus size is around 10^-15 meters.