Physics Textbook 9th Class

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Physics Textbook 9th Class. We covered all the Physics Textbook 9th Class MCQs in this post for free so that you can practice well for the exam.

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Physics Textbook 9th Class Objective for Students

The electromagnetic waves are

a. Longitudinal waves

b. Mechanical waves

c. Transverse waves

d. Progressive waves

Option c – Transverse waves

In refraction mode, the frequency of electromagnetic wave

a. changes with time

b. doesn’t change

c. decreases

d. increases

Option b – doesn’t change

A wire of a uniform area of cross-section is stretched such that its length is doubled. Its resistance

a. Doesn’t change

b. Becomes 8 times

c. Becomes half

d. Becomes 4 times

Option d – Becomes 4 times

When the temperature of a semiconductor is raised, its resistance

a. Decreases

b. Increases

c. Doesn’t change

d. None of these

Option a – Decreases

Ohm’s law holds good for

a. All conductors

b. All metal conductors

c. All semiconductors

d. Ionic solutions

Option b – All metal conductors

In the case of some substances, the resistance becomes zero at low temperatures, these substances are called

a. Superconductors

b. Semiconductors

c. Dielectrics

d. Full conductors

Option a – Superconductors

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