Latest Science and Technology General Knowledge(GK) Questions and answers

1 .

An ideal voltage source will charge an ideal capacitor

A)

Exponentially

B)

In infinite time

C)

Instantaneously

D)

None of the above

Correct Answer : Option (C) - Instantaneously

Since the voltage source is ideal, therefore its internal resistance is zero. Therefore, the time constant for the circuit becomes 0. Hence, the capacitor will charge and discharge instantaneously.

2 .

Iodine number is an indication of

A)

Specific gravity

B)

Rancidity

C)

Chain length

D)

Degree of unsaturation

Correct Answer : Option (D) - Degree of unsaturation

The iodine value (IV) indicates the degree of unsaturation of a fat or oil. It is defined as the number of grams of iodine absorbed by 100 g of fat.

3 .

Charcoal can be made at home by burning

A)

coal in absence of air

B)

wood in absence of air

C)

wood in an insufficient supply of air

D)

coal in an insufficient supply of air

Correct Answer : Option (B) - wood in absence of air

4 .

Which among the following is the major cause of acid rain?

A)

Oxygen

B)

Carbon monoxide

C)

Carbon dioxide

D)

Nitrogen dioxide

Correct Answer : Option (D) - Nitrogen dioxide

Sulfur dioxide and nitrogen oxides can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

5 .

Why do the plant closes stomata when it does NOT need carbon dioxide for photosynthesis?

A)

To prevent water loss

B)

To release stored oxygen

C)

To store carbon dioxide

D)

None of the above

Correct Answer : Option (A) - To prevent water loss

6 .

The Equator does NOT pass through which of the following countries?

A)

Mexico

B)

Kenya

C)

Indonesia

D)

Brazil

Correct Answer : Option (A) - Mexico

The Equator does not pass through Mexico. The equator passes through 13 countries: Ecuador, Colombia, Brazil, Sao Tome & Principe, Gabon, Republic of the Congo, Democratic Republic of the Congo, Uganda, Kenya, Somalia, Maldives, Indonesia and Kiribati.

7 .

How many days moon takes to revolve around the earth?

A)

25.3

B)

26.3

C)

27.3

D)

28.3

Correct Answer : Option (C) - 27.3

Knowing how this dance between the Moon, Earth and Sun plays out lets us understand the Moon's constantly changing appearance. Moon fact: The Moon's phases repeat every 29.5 days, but it's orbit around the Earth only takes 27.

8 .

At which of the following place, weight of an object is maximum?

A)

At equator

B)

At poles

C)

At tropic of cancer

D)

At tropic of Capricorn

Correct Answer : Option (B) - At poles

9 .

The ozone layer protects us from harmful _______________ rays of the sun.

A)

ultraviolet

B)

gamma

C)

infrared

D)

cosmic

Correct Answer : Option (A) - ultraviolet

The ozone layer acts as an invisible shield and protects us from harmful ultraviolet (UV) radiation from the sun. In particular, the ozone layer protects us from the UV radiation, known as UV-B, which causes sunburn.

10 .

What is a Pepper plant ?

A)

Tree

B)

Bush

C)

Shrub

D)

Vine

Correct Answer : Option (D) - Vine

Black pepper is a flowering vine in the family Piperaceae, cultivated for its fruit, known as a peppercorn, which is usually dried and used as a spice and seasoning. When fresh and fully mature, the fruit is about 5 mm in diameter, dark red, and contains a single seed, like all drupes.