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Dawn of Modern Physics /
Quiz 1

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NCAT - Practice Test - Physics - Dawn of Modern Physics Quiz

Attempt 10 MCQs on NCAT - Practice Test - Physics - Dawn of Modern Physics | Quiz 1

1. How is energy emitted or absorbed according to quantum theory?

Continuous
Discrete packets (quanta)
Only in waves
Infinite

2. What is the formula for photon energy?

E = h/λ
E = hf
E = hc/λ
Both B and C

3. What is the value of Planck's constant?

6.63 × 10⁻³⁴ J·s
6.63 × 10⁻³⁴ J/s
6.63 × 10⁻³⁴ N·m
6.63 × 10⁻³⁴ eV·s

4. What is the particle model of light?

Waves only
Particles only
Both waves and particles
Photons only

5. What is the photoelectric effect?

Emission of electrons
Emission of photons
Absorption of electrons
Reflection of light

6. What is the minimum frequency for photoelectric effect called?

Cut-off frequency
Threshold frequency
Resonant frequency
Critical frequency

7. What is the minimum energy needed to remove an electron from a metal?

Kinetic energy
Potential energy
Work function
Ionization energy

8. What is Einstein's photoelectric equation?

K_max = hf + φ
K_max = hf - φ
K_max = φ - hf
K_max = hf/φ

9. What is the voltage that stops photoelectrons called?

Stopping potential
Threshold voltage
Breakdown voltage
Cut-off voltage

10. What is the relation between stopping potential and maximum KE?

K_max = e/V_s
K_max = eV_s
K_max = V_s/e
K_max = hV_s

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Instructions: Select one answer per question. After submitting, you will see your score, correct answers, and explanations.

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