Chemistry » Sawaal Buzz

Q 1.

The most electropositive elements-

A) Na

B) Ca

C) H

D) Cs

Answer & Explanation Answer: Cs

Explanation:

D) Cs

View Answer Discuss

MCQ Type: Chemistry

Q 2.

The first metal used by man-

A) Gold

B) Iron

C) Copper

D) Silver

Answer & Explanation Answer: Copper

Explanation:

C) The first metal used by man - Copper

View Answer Discuss

MCQ Type: Chemistry

Q 3.

The mass number of a nucleus-

A) total number of protons and neutrons

B) always more than the atomic weigh

C) always less than its atomic number

D) None of these

Answer & Explanation Answer: total number of protons and neutrons

Explanation:

A) total number of protons and neutrons

View Answer Discuss

MCQ Type: Chemistry

Q 4.

The graphite rods in the nuclear reactor-

A) produce neutrons

B) react with U to release energy

C) convert fast moving neutrons into thermal neutrons

D) None of these

Answer & Explanation Answer: convert fast moving neutrons into thermal neutrons

Explanation:

C) convert fast moving neutrons into thermal neutrons

View Answer Discuss

MCQ Type: Chemistry

Q 5.

The manufacture of vanaspati from vegetable oil used-

A) $H_{2}$

B) $co_{2}$

C) $O_{2}$

D) None of these

Answer & Explanation Answer: $H_{2}$

Explanation:

A) $H_{2}$

View Answer Discuss

MCQ Type: Chemistry

Q 6.

The items amenable to detection by soft x-rays-

A) genuine coins from counterfeit coins

B) lead in bullets

C) contrabands

D) None of these

Answer & Explanation Answer: genuine coins from counterfeit coins

Explanation:

A) genuine coins from counterfeit coins.

View Answer Discuss

MCQ Type: Chemistry

Q 7.

In the froth floatation process used oil-

A) Kerosene Oil

B) Pine Oil

C) Coconut Oil

D) None of these

Answer & Explanation Answer: Pine Oil

Explanation:

B) Pine Oil

View Answer Discuss

MCQ Type: Chemistry

Q 8.

The number of waves in n x 10^th Bohr’s orbit –

A) n³

B) n²

C) n

D) None of these

Answer & Explanation Answer: n

Explanation:

C) n

View Answer Discuss

MCQ Type: Chemistry

Q 9.

The main use of salt in the diet –

A) increase the solubility of food particles in water

B) taste of food better

C) produce in small amounts the hydrochloric acid required for the digestion

D) None of these

Answer & Explanation Answer: produce in small amounts the hydrochloric acid required for the digestion

Explanation:

C) produce in small amounts the hydrochloric acid required for the digestion

View Answer Discuss

MCQ Type: Chemistry

Q 10.

The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is-

A) 4.84 x 10¹⁷

B) 6.023 x 10¹⁹

C) 6.023 x 10²³

D) None of these

Answer & Explanation Answer: 6.023 x 10¹⁹

Explanation:

B) 6.023 x 10¹⁹

View Answer Discuss

MCQ Type: Chemistry

01
02
03
>
Last