[{"id":122016,"question":"If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity","choices":[{"text":"v/A = constant","value":"A"},{"text":"A/v = constant","value":"B"},{"text":"Av = constant","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":122015,"question":"Two water pipes of diameters 4 cm and 8 cm are connected with a supply line. The velocity of flow of water in the pipe 4 cm diameter is","choices":[{"text":"1/4 times","value":"A"},{"text":"4 times","value":"B"},{"text":"Twice","value":"C"},{"text":"1/2 of 8 cm diameter pipe","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":122014,"question":"The rain drop falling from the sky reach the ground with","choices":[{"text":"Constant terminal velocity","value":"A"},{"text":"Constant gravitational acceleration","value":"B"},{"text":"Variable acceleration","value":"C"},{"text":"acceleration greater than g","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":122013,"question":"In case of streamed lined flow of liquid, the loss of energy is","choices":[{"text":"Maximum","value":"A"},{"text":"Minimum","value":"B"},{"text":"Infinite","value":"C"},{"text":"equal to what is in turbulent flow","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":122012,"question":"Fluids resist force, This property is called","choices":[{"text":"Stiffness","value":"A"},{"text":"Strength","value":"B"},{"text":"Ductility","value":"C"},{"text":"Elasticity","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":122011,"question":"The fluid which is incompressible and non viscous is called","choices":[{"text":"Ideal fluid","value":"A"},{"text":"Non-ideal fluid","value":"B"},{"text":"Prefect fluid","value":"C"},{"text":"All","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":122010,"question":"The electrical forces between the molecules of a liquid are","choices":[{"text":"Repulsive","value":"A"},{"text":"Attractive","value":"B"},{"text":"Both A and B","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":122009,"question":"A container has a small hole in the bottom. Air can go through this hole,but water cannot. This can be best explained by the statement that","choices":[{"text":"water contains hydrogen atoms, air does not","value":"A"},{"text":"water molecules are smaller than molecules in the air","value":"B"},{"text":"water molecules are smaller than molecules in the air","value":"C"},{"text":"surface tension of the water prevents it from","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":122008,"question":"If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 g/cm<sup>2</sup>will be","choices":[{"text":"1 cm","value":"A"},{"text":"2 cm","value":"B"},{"text":"8 cm","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":122001,"question":"When the velocity of a liquid flowing steadily in a tube increases, its pressure?","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Remains same","value":"C"},{"text":"Zero","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121998,"question":"Fire fighters have jet attached to the head of their water pipes in order to","choices":[{"text":"Increase the mass of water flowing per second","value":"A"},{"text":"Increase the velocity of water flowing out","value":"B"},{"text":"Increase the volume of water flowing per second","value":"C"},{"text":"Avoid wastage of water","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121997,"question":"Deep water almost runs still when surface water flow in rivers. What does it explains","choices":[{"text":"Magnus effect","value":"A"},{"text":"Equation of continuity","value":"B"},{"text":"Surface energy","value":"C"},{"text":"Bernoulli's equation","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121996,"question":"Fire fighters have a jet attached to the head of their water pipes in order to head of their water pipes in order to","choices":[{"text":"Increase the mass of water flowing per second","value":"A"},{"text":"Avoid wastage of water","value":"B"},{"text":"Increase the velocity of water flowing out","value":"C"},{"text":"Increase the volume of water flowing per second","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121995,"question":"Surface tension of water is reduced by adding","choices":[{"text":"Detergents","value":"A"},{"text":"Camphor","value":"B"},{"text":"Plastic","value":"C"},{"text":"Both A and B","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121994,"question":"Bernoulli's equation is based upon law of conversation of","choices":[{"text":"mass","value":"A"},{"text":"momentum","value":"B"},{"text":"Energy","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":3}]