The device used to measure very high temperatures (e.g., furnace) is MCQ with Answer and Explanation

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The device used to measure very high temperatures (e.g., furnace) is

A. Thermometer

B. Thermocouple

C. Bolometer

D. Pyrometer

Answer: Option D

Solution (By JKExamLibrary)

Pyrometer measures high temperatures by radiation without contact.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The gravitational force between two masses is F. If the distance is tripled, force becomes

A. F/9

B. 9F

C. 3F

D. F/3

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Correct Answer: Option A

Explanation:
F ∝ 1/r², so if r→3r, F→F/9.

This question belongs to: Science Physics

Question #2 Report Error

A bullet of mass 20 g fired from a gun of mass 5 kg with velocity 200 m/s. Recoil velocity of gun is

A. 2 m/s

B. 1 m/s

C. 0.8 m/s

D. 0.4 m/s

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Correct Answer: Option C

Explanation:
Conservation of momentum: 0 = (0.02×200) + (5×v) => v = -4/5 = -0.8 m/s (magnitude 0.8 m/s).

This question belongs to: Science Physics

Question #3 Report Error

According to Joule's law of heating, the heat produced in a resistor is directly proportional to the square of:

A. Electric Current

B. Time

C. Resistance

D. Voltage

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Correct Answer: Option A

Explanation:
Joule's Law of Heating states that the heat (H) produced in a resistor is given by H = I²Rt. This indicates that the heat produced is directly proportional to the square of the electric current (I), directly proportional to the resistance (R), and directly proportional to the time (t) the current flows.

This question belongs to: Science Physics

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