General Science Test 11 General Science Please enter your email: 1. How does the Pouring of kerosene oil on stagnant water help to eradicate malaria ? The smell of kerosene oil keeps away mosquitoes. Kerosene oil kills ffies. Kerosene oil spreads on the surface of water and forms a fine layer. Thus, mosquitoes cannot lay their eggs on water. Kerosene oil poisons the water. 2. Why is it essential for an aeroplane to run on the runway before the take off ? Because, in this way, the air-worthiness of the aeroplane is tested. Because it helps increase the pressure of air acting oil it. Because it helps increase the temperature of the aeroplane. None of these. 3. How does, saft straw work? All of these. When air is sucked, eddy currents are produced inside the straw. These eddy currents force the soda to rise upwards. When air is sucked, the force of adhesion between the soda and. straw is reduced. Due to this reduction in the magnitude of the adhesive force, the soda rises in the straw. When air is sucked, a low pressure is created inside the straw. But pressure outside the straw remains high. This differenct in pressure forces the soda upwards. 4. Why does a ship made of steel float though a steel ball sinks Because weight of water displaced by a ball is less than its own weight, while the weight of water displaced by a ship is greatm than its own weight. In the case of ship. action and reaction are equal and opposite whereas in,case of ball action is greater than reaction. Because ship is propelled by an engine,. The force of gravitation between the earth and the ship is ,enough to keep ship stable. In the case of ball, this force is so. small ~that the ball cannot be stable. 5. How a boatman should row if he wants to take his boat to a poim*t just opposite on the other bank of the river ? In whatever way he may row, he cannot reach that point. He should row in a direction inclined to the bank up-stream. He should row straight towards that point. None of these. 6. Why a hydrogen balloon rises ? Because hydrogen is lighter than air, Because hydrogen is attracted by the sun. Because hydrogen is attracted by the moon. Because hydrogen is endowed with the property of rising vertically upwards. 7. A light year is a unit of distance. velocity. intensity of light. time. 8. A brick and a coin are released from the same height, at the same time, in vacuum. Which will hit the ground first ? Both will hit the ground at the same time. Both will never hit the ground. The coin will hit the ground first. The brick will hit the ground first. 9. What is the physital principle involved in skating ? Action and reaction are equal and opposite. Law of conservation of energy. Law of conservation of momentum. Law of conservation of mass. 10. Why sand is provided for high jumpers to fall on in place of hard ground Because sand is cooler than the hard ground. Because sand is hotter than the hard ground. Because the jumper can penetrate some distance before commg to rest. Because of none of these. Loading … Question 1 of 10 Previous PostGeneral Knowledge 244 Next PostGeneral Science Test 4
