The heating element of a heater is made of nichrome because it has MCQ with Answer and Explanation

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The heating element of a heater is made of nichrome because it has

A. High resistivity, high melting point

B. High resistivity, low melting point

C. Low resistivity, high melting point

D. Low resistivity, low melting point

Answer: Option A

Solution (By JKSSB Mock Tests)

Nichrome high resistivity generates more heat, high melting point avoids melting at high temperature.

This question belongs to: Science Physics

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Question #1

A force of 12 N gives an object acceleration 4 m/s². Mass of object is

A. 8 kg

B. 48 kg

C. 3 kg

D. 0.33 kg

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Correct Answer: Option C

Explanation:
m = F/a = 12/4 = 3 kg.

This question belongs to: Science Physics

Question #2

The scientist who gave the theory of relativity is

A. Einstein

B. Planck

C. Newton

D. Maxwell

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Correct Answer: Option A

Explanation:
Albert Einstein: special (1905) and general relativity (1915).

This question belongs to: Science Physics

Question #3

The phenomenon of bouncing back of light from a surface is called

A. Diffraction

B. Refraction

C. Reflection

D. Dispersion

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Correct Answer: Option C

Explanation:
Reflection: light returns into same medium. Laws: angle i = angle r. Refraction is bending into another medium. Dispersion splitting colours. Diffraction spreading around obstacles.

This question belongs to: Science Physics

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