Q. Which one of the following instruments is used for locating submerged objects in the ocean?
1) Audio meter
2) Galvanometer
3) Sextant
4) Sonar
Q. Which of the following is a naturally occurring hardest substance on the earth?
1) Graphite
2) Wurtzite boron nitride
3) Iron
4) Diamond
Q. Driving force of an ecosystem is -
1) Carbohydrate
2) Biomass
3) Carbon
4) Solar energy
Q. An ultimate source of energy stored in fossil fuels is -
1) Earth
2) Sun
3) Sea
4) Moon
Q. Which one of the following colours of white light is least deviated by the glass prism?
1) Green colour
2) Red colour
3) Violet colour
4) Orange colour
Q. Which of the following is used in fire alarm?
1) Photo cell
2) Water
3) Solar cell
4) None of the above
Q. A 100 W electric bulb is used for 10 hours a day. How many units of energy are consumed in 30 days?
1) 1
2) 10
3) 30
4) 300
Q. An echo is heard after 5 seconds of the production of sound which moves with a speed of 340 m/s. What is the distance of the mountain from the source of sound which produced the echo?
1) 0.085 km
2) 0.85 km
3) 0.17 km
4) 1.7 km
Q. What is the more common name for solid carbon dioxide?
1) Potash
2) Quick Silver
3) Epsom
4) Dry Ice
Q. Which of the following is a highly reactive metal?
1) Sodium
2) Calcium
3) Magnesium
4) Aluminium
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