Which one of the following is used in making pencils ?

A: Charcoal

B: Graphite

C: Phosphorous

D: Silicon

Which among the following acid is present in gastric juice ?

A: Acetic Acid

B: Citric Acid

C: Sulfuric Acid

D: Hydrochloric Acid

What happens in endothermic reaction ?

A: Heat is absorbed

B: Heat is evolved

C: Light is produced

D: Temperature increases

Which metal exist in the form of liquid at room temperature ?

A: Sodium

B: Mercury

C: Magnesium

D: Bismuth

Who discovered radioactivity ?

A:Thomson

B: Bacquerel

C: Rutherford

D: Kelvin

Red Blood Cell have lifespan of ?

A. 120

B. 140

C. 130

D. 60

Night blindness caused by the deficiency of?

A: Vitamin B

B: Vitamin C

C: Vitamin A

D: Vitamin D

What is the percentage of water in Milk ?

A: 75%

B: 70%

C: 90%

D: 80%

Percentage of alcohol in rectified spirit?

A: 90%

B: 85%

C: 80%

D: 95%

How copper can be converted into gold ?

A: By Chemical reaction

B: By Electroplating

C: By Artificial radioactivity

D: By Heating