Assertion (A): In a free fall, a heavy object falls faster than a light object. Reason (R): Acceleration due to gravity is same for all objects. MCQ with Answer and Explanation

Question

Assertion (A): In a free fall, a heavy object falls faster than a light object. Reason (R): Acceleration due to gravity is same for all objects.

A. Both A and R true, R is correct explanation

B. Both A and R true, R not correct explanation

C. A is true, R is false

D. A is false, R is true

Answer: Option D

Solution (By JKSSB Mock Tests)

In vacuum, all objects fall at same rate. A is false. R is true. So C correct.

This question belongs to: Science Physics

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Question #1

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The energy of electron in ground state of hydrogen is -13.6 eV. Ionization energy is

A. 27.2 eV

B. 13.6 eV

C. 3.4 eV

D. 0 eV

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Correct Answer: Option B

Explanation:
Ionization energy is energy to remove electron from ground state to infinity, 13.6 eV.

This question belongs to: Science Physics

Question #2

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The phenomenon of apparent change in frequency due to relative motion between source and observer is called

A. Echo

B. Resonance

C. Doppler effect

D. Diffraction

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Correct Answer: Option C

Explanation:
Doppler effect: observed frequency higher when approaching, lower when receding. Applications: radar speed guns, astronomical redshift/blueshift, echocardiography. Echo is reflection. Resonance is vibration matching. Diffraction is bending.

This question belongs to: Science Physics