A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. Silicon

Oxygen is the most abundant element in the earth’s crust and silicon is next.

A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. Silicon
Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8.

A. 4
B. 5
C. 6
D. 7

A. Star
B. Planet
C. Asteroid
D. Meteor

A device which converts chemical energy into electrical energy is called __________?

A. motor
B. generator
C. moving-coil meter
D. battery

Batteries are devices that convert stored chemical energy into useful electrical energy. It consists of a number of voltaic cells connected in series by a conductive electrolyte containing anions and cations. A battery may be thought of as a clever variant of a standard exothermic chemical reactor that yields chemical products with lower energy content than the chemical reactants.
Also read about A device that converts mechanical energy into electric energy is called_______?

A. Kelvin
B. Thomson
C. Rutherford
D. Bacquerel

A. 1 g/cm3
B. 1.5 g/cm3
C. 2 g/cm3
D. none of these

A. 60
B. 120
C. 180
D. 240

A. also decrease
B. increase
C. remains constant
D. none of these

A. Night blindness
B. rickets
C. scurvy
D. hair fall