Explanation

The common cold is caused by a viral infection, primarily by rhinoviruses.

Cholera and typhoid, in contrast, are caused by bacterial infections.

Explanation

Dates, honey, and grapes are sweet due to the presence of fructose.

It is a simple sugar (monosaccharide) that is naturally found in many fruits, honey, and some vegetables.

Fructose is a key contributor to the sweetness of these foods.

Explanation

The main component of a virus is nucleic acid, which can be either DNA or RNA.

This genetic material is surrounded by a protein coat.

It is essential for the virus's ability to replicate and infect host cells.

Explanation

National Institute of Child Health and Human Development (NICHD) is a part of the National Institutes of Health (NIH).

It's mission is to support research and programs that improve the health and well-being of children, adults, and families.

NICHD supports research on various topics, including developmental biology, reproductive health, and child health and development.

Explanation

350 runs were scored by our team in the Inter-college Cricket Tournament.

In passive voice, the object of the active sentence becomes the subject, and the verb is in the past participle form, making "were scored" the correct construction.

Explanation

Let the ages of the father and son be M and N years respectively

Given,

⇒ M = 3N + 3      ….(1)

After 3 years,

⇒ (M + 3) = 10 + 2(N + 3)

⇒ M + 3 = 10 + 2N + 6

⇒ M – 2N = 13      ….(2)

Subtracting equation (1) from (2),

⇒ 3N + 3 – 2N = 13

⇒ N = 10

Then,

⇒ M = 30 + 3 = 33

Explanation

Burning wood is a chemical change because it involves combustion.

Wood reacts with oxygen to form new substances, such as ash, carbon dioxide, and water vapor.

Explanation

The moon doesn't produce its own light; we see it because it reflects sunlight.

The light that reaches the moon from the sun bounces back to Earth.

This making the moon visible to us.

Explanation

The pattern is:

• 10 is repeated at regular intervals (every 2 terms)
• The other terms are increasing by 7: 14 + 7 = 21, 21 + 7 = 28

So, the correct answer is 28.

Explanation

He said that he would help you the next day.

In narration, the future tense "will" changes to "would," and "tomorrow" is transformed to "the next day" to reflect the shift in time reference.