general science MCQ

 Q.1

Which one among the following would expand the most on being heating?

(A) 

Water

(B) 

Air

(C) 

Alcohol

(D) 

Glass

Correct Answer (B)

Q.2

Which one of the following is a chemical change?

(A) 

Distillation of sea (salty) water

(B) 

Crystallisation of impure salt NaCl

(C) 

Production of iodine (I2) from sea-weeds

(D) 

Sublimation of iodine (I2)

Correct Answer (C)

Q.3

What is the weight of one atom of hydrogen in gram?

(A) 

6.023 × 10-23

(B) 

1.66 × 10-24

(C) 

6.62 × 10-24

(D) 

None of the above

Correct Answer (B)

Q.4

In which conversion, H2O molecules lose heat?

(A) 

Ice $\to$ Water

(B) 

Ice $\to$ Steam

(C) 

Steam $\to$ Ice

(D) 

Water $\to$ Steam

Correct Answer (C)

Q.5

Iodised salt is a

(A) 

mixture of potassium iodide and common salt

(B) 

mixture of molecular iodine and common salt

(C) 

compound formed by combination of potassium iodide and common salt

(D) 

compound formed by combination of molecular iodine and common salt

Correct Answer (A)

Q.6

Which one of the following is the correct sequence of the given substances in the decreasing order of their densities ?

(A) 

Steel > Mercury > Gold

(B) 

Gold > Mercury > Steel

(C) 

Steel > Gold > Mercury

(D) 

Gold > Steel > Mercury

Correct Answer (B)

Q.7

Which one of the following does not increase while moving down the group of the periodic table?

(A) 

Atomic radius

(B) 

Metallic character

(C) 

Valency

(D) 

Number of shells in an element

Correct Answer (C)

Q.8

Which one of the following metals is allowed with sodium to transfer heat in a nuclear reactor?

(A) 

Potassium

(B) 

Calcium

(C) 

Magnesium

(D) 

Strontium

Correct Answer (A)

Q.9

Which one of the following alkali metals has lowest melting point?

(A) 

Sodium

(B) 

Potassium

(C) 

Rubidium

(D) 

Cesium

Correct Answer (D)

Q.10

Assertion (A) Ionisation energy decreases on moving down the group.
Reason (R) Force of attraction between valence electrons and nucleus decreases on moving down the group.

(A) 

Both A and R are true and R is the correct explanation of A

(B) 

Both A and R are true, but R is not the correct explanation of A

(C) 

A is true, but R is false

(D) 

A is false, but R is true

Correct Answer (A)