Army gd

Ques 21: ………..is essential in soil for plant growth.

• Carbon dioxide
• Oxygen
• Nitrogen
• Hydrogen

Ans- Nitrogen

Ques 22: Who discovered oxygen ?

• Albert Einstein
• john Emburey
• Graham Bell
• Joseph Priestly

Ans – Joseph Priestly

Ques 23: Urea fertilizer is ?

• Nitrogenous
• Potassium based
• Phosphoric
• Mixed

Ans – Nitogenous

Ques 24: Polio is caused by a type of

• Bacteria
• None of these
• Fungus
• Virus

Ans – Virus

Ques 25: What is Orion ?

• Constellation
• Meteor
• Galaxy
• Planet

Ans – Galaxy

Ques 26: How many colours are there in a spectrum of light ?

• 5
• 1
• 7
• 3

Ans – 7

Ques 27: Which types of pollution is responsible for Acid rains ?

• Soil pollution
• Air pollution
• Water pollution
• Noise pollution

Ans – Air pollution

Ques 28: In nuclear reactor heavy water is used as

• Moderator
• Atomic smasher
• Coolant
• Fuel

Ans – coolant

Ques 29: ………….. is produced by the vibration of bodies.

• Electricity
• Light
• Thunder
• Sound

Ans – sound

Ques 30: What is the chemical formula of Salt ?

• ZnC
• NaCl
• NaOH
• KCl

Ans – NaCI