Explanation

An electrostatic precipitator is a device used in factories and power plants to remove dust and smoke particles from exhaust gases.

It helps in air pollution control by using electrical charges to attract and collect harmful particles.

Explanation

In 1926, Schrödinger proposed the Quantum model of the atom using wave equations.

This model describes electrons as wave-like rather than fixed orbits.

Explanation

"Cloud" begins with the consonant sound "C", not a vowel sound.

The Ostrich, Apricot, Octopus — start with vowel sounds.

Explanation

John B. Watson is known as the father of behaviorism, emphasizing the study of observable behavior over internal mental states.

He believed that behavior is learned and shaped by the environment and experience.

Explanation

Electrons involved in bond formation are in the valence shell, the outermost electron shell.

These electrons participate in chemical bonding between atoms.

Explanation

A diverging beam consists of rays spreading out from a point or axis.

It occurs when light passes through a concave lens or reflects from a convex mirror.

Explanation

The teacher says that if you work hard, you will pass the test.

The reporting verb "says" is in the present tense, so no tense change is needed.

Quoted speech becomes indirect: "you" remains "you" as it's a general statement.

Explanation

One day = 24 hours, and each hour has 60 minutes.

24 × 60 = 1440 minutes in a full day and night.

A full day consists of 24 hours, split between day and night.

There are 86,400 seconds in a day (24 hours x 60 minutes x 60 seconds).

Explanation

r is inversely proportional to p³, so r = k/p³.

Given p = 9 and r = 2:

2 = k/729

k = 2 × 729 = 1458

Now, r = 1/4:

1/4 = 1458/p³

p³ = 1458 × 4 = 5832

p = 18

Explanation

The noun "arm" changes meaning in plural form:

• Arm (singular): A limb of the body.
• Arms (plural): Can mean weapons or weapons collectively.