The salinity of the sea water is:

• 1.5 %
• 2.5 %
• 3.5 %
• 4.5 %
Solution
Correct Option: C  [ 3.5 % ]

Explanation:

Sound waves having frequency less than 20 Hz are called __________ waves.

• Intelligent
• Inferior
• Infrasonic
• Instrumental
Solution
Correct Option: C  [ Infrasonic ]

Explanation:

Which type of fire extinguisher is used for petroleum fire?

• Powder type
• Liquid type
• Soda acid type
• Foam type
Solution
Correct Option: A  [ Powder type ]

Explanation:

Sound causes hazardous noise pollution at decibels:

• Above 50
• Above 80
• Above 100
• Above 130
Solution
Correct Option: B  [ Above 80 ]

Explanation:

Iodoform is used as an:

• antipyretic
• analgesic
• antiseptic
• anaesthetic
Solution
Correct Option: C  [ antiseptic ]

Explanation:

A Barometer can be used for :
1)Measuring atmospheric pressure
2)Determining altitudes
3)Measuring density of liquid
4)Weather forecasting

• 1 only
• 1,2 and 4 only
• 1 and 4 only
• 4 only
Solution
Correct Option: B  [ 1,2 and 4 only ]

Explanation:

Consider the following pairs of scientists and Discoveries :

  discoveries  :  Scientists

(i) Copernicus : Law of gravitation

(ii) Kepler : Laws of planetary motion

(iii) Galileo : Moons of Jupiter

(iv) Newton : Heliocentric theory

Select the correctly matched pairs using the codes given below.

• (i) and (ii) only
• (i), (ii) and (iii) only
• (i), (ii), (iii) and (iv)
• (ii) and (iii) only
Solution
Correct Option: D  [ (ii) and (iii) only ]

Explanation:

Magnetic effect of current gives rise to which force ?

• mechanical
• frictional
• spring
• gravitational
Solution
Correct Option: A  [ mechanical ]

Explanation:

Saliva helps in the digestion of:

• fats
• starch
• proteins
• vitamins
Solution
Correct Option: B  [ starch ]

Explanation:

Which disease is caused by Nickel ?

• Itai Itai
• Dermatitis
• Learning Disability
• Asthma
Solution
Correct Option: B  [ Dermatitis ]

Explanation: