The most abundant natural Iron Oxides are:
- (A) Magnetite and Pyrite
- (B) Magnetite and Bauxite
- (C) Hematite and Pyrite
- (D) Hematite and Magnetite
- (D) Hematite and Magnetite
The two most abundant elements in sea water are:
- (A) Sodium and Potassium
- (B) Sodium and Calcium
- (C) Sodium and Chlorine
- (D) Chlorine and Iodine
- (C) Sodium and Chlorine
An electric current can produce:
- (A) Chemical effect
- (B) Magnetic effect
- (C) Heating effect
- (D) All of three
- (D) All of three
The unit of home electricity energy consumption is:
- (A) Watt hour
- (B) Kilowatt hour
- (C) Joule hour
- (D) None of these
- (B) Kilowatt hour
The magnet always points in the same direction, if allowed to move freely i.e. towards North and South poles, because of:
- (A) Gravitational field
- (B) A lot of metal deposits on North and South Poles
- (C) Due to attraction of North Pole and repulsion of Western Pole
- (D) Earth is huge magnet
- (D) Earth is huge magnet
When sound is reflected from floor, ceiling or a wall, it mixes with the original sound and changes its complexion, it is called as:
- (A) Sound
- (B) Echo
- (C) Reverberation
- (D) Noise
- (C) Reverberation
The speed of sound in dry air at 20°C is about:
- (A) 130 meters per second
- (B) 230 meters per second
- (C) 330 meters per second
- (D) 430 meters per second
- (C) 330 meters per second
The speed of light in vacuum:
- (A) 300 Million meters per second
- (B) 300 Million meters per hour
- (C) 300 Million kilometres per second
- (D) 300 Million kilometres per hour
- (A) 300 Million meters per second
The time, light takes from the Sun to reach Earth is:
- (A) 8 minutes
- (B) 25 minutes
- (C) 45 minutes
- (D) 48 minutes
- (A) 8 minutes
Light from the Sun travels a distance before it reaches the Earth:
- (A) 50 million Km
- (B) 100 million Km
- (C) 150 million Km
- (D) 200 million Km
- (C) 150 million Km