Which among the following is a positively charged particle emitted by a radioactive element?
A. Beta ray
B. Alpha ray
C. Cathode ray
D. Gamma ray
Answer: Option B
A. Beta ray
B. Alpha ray
C. Cathode ray
D. Gamma ray
Answer: Option B
The tree which sends down roots from its branches to the soil is known as:
A. Oak
B. Pine
C. Banyan
D. Palm
Brass gets discoloured in air because of the presence of which of the following gases in air?
A. Oxygen
B. Hydrogen Sulphide
C. Carbon dioxide
D. Nitrogen
Which of the following is a non metal that remains liquid at room temperature?
A. Phosphorous
B. Bromine
C. Chlorine
D. Helium
Why