Q. Water is heated with a coil of resistance R connected to domestic supply. The rise of temperature of water will depend on -
1. Supply voltage.
2. Current passing through the coil.
3. Time for which voltage is supplied.
Select the correct answer from among the following -
1) 1, 2 and 3
2) 1 and 2 only
3) 1 only
4) 2 and 3 only
Q. The loudness of sound depends upon the -
1) velocity of sound waves in the medium
2) amplitude of the sound waves
3) frequency of the sound waves
4) frequency and velocity of the sound waves
Q. Net movement of water from a dilute to a concentrated solution through a selectively permeable membrane is called -
1) Diffusion
2) Dispersion
3) Osmosis
4) Absorption
Q. 10 g of ice at -100C is mixed with 10 g of water at 00C. The amount of heat required to raise the temperature of mixture to 100C is -
1) 400 cal
2) 550 cal
3) 1050 cal
4) 1200 cal
Q. Which one of the following statements regarding lenses is not correct?
1) A convex lens produces both real and virtual images
2) A concave lens produces both real and virtual images
3) A convex lens can produce images equal, greater and smaller than the size of the object
4) A concave lens always produces images smaller than the size of the object
Q. If the work done on the system or by the system is zero, which one of the following statements for a gas kept at a certain temperature is correct?
1) Change in internal energy of the system is equal to flow of heat in or out of the system
2) Change in internal energy of the system is less than heat transferred
3) Change in internal energy of the system is more than the heat flow
4) Cannot be determined
Q. A student measures certain lengths using a meter scale having least count equal to 1 mm. Which one of the following measurements is more precise?
1) 0.50 mm
2) 29.07 mm
3) 0.925 m
4) 910 mm
Q. A car starts from Bengaluru, goes 50 km in a straight line towards south, immediately turns around and returns to Bengaluru. The time taken for this round trip is 2 hours. The magnitude of the average velocity of the car for this round trip -
1) is 0.
2) is 50 km/ hr.
3) is 25 km/ hr.
4) cannot be calculated without knowing acceleration.
Q. The sum of emf's and potential differences around a closed loop equals zero is a consequence of -
1) Ohm's law
2) Conservation of charge
3) Conservation of momentum
4) Conservation of energy
Q. A solid disc and a solid sphere have the same mass and same radius. Which one has the higher moment of inertia about its center of mass?
1) The disc
2) The sphere
3) Both have the same moment of inertia
4) The information provided is not sufficient to answer the question