Which of the following is most elastic material?
- (A) Steel
- (B) Rubber
- (C) Glass
- (D) None of these
- (A) Steel
Nitrogen was discovered by Daniel Rutherford in:
- (A) 1772
- (B) 1774
- (C) 1777
- (D) 1779
- (A) 1772
The name of common mineral salt present in human sweat is:
- (A) Calcium oxalate
- (B) Potassium sulfate
- (C) Sodium chloride
- (D) None of these
- (C) Sodium chloride
The tartness of Coca-Cola comes from the use of:
- (A) Acetic acid
- (B) Phosphoric acid
- (C) Lactic acid
- (D) None of these
- (B) Phosphoric acid
Diamond is very expensive ornament. It is composed of a single element:
- (A) Carbon
- (B) Gold
- (C) Silver
- (D) None of these
- (A) Carbon
When we jump out of the boat standing still water, the boat becomes:
- (A) Forwards
- (B) Backwards
- (C) Doesn’t move
- (D) None of these
- (B) Backwards
The body is full of pores externally and canals internally:
- (A) Tapeworms
- (B) Sponges
- (C) Earthworms
- (D) None of these
- (B) Sponges
What type of change is it when metal expands on heating?
- (A) Chemical
- (B) Physical
- (C) Irreversible
- (D) None of these
- (B) Physical
The speed of sound in steel is approximately:
- (A) 3100 m/s
- (B) 4100 m/s
- (C) 5100 m/s
- (D) None of these
- (C) 5100 m/s
The speed of sound in water is approximately:
- (A) 1200 m/s
- (B) 1325 m/s
- (C) 1480 m/s
- (D) None of these
- (C) 1480 m/s