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
Q. If an object moves at a non-zero constant acceleration for a certain interval of time, then the distance it covers in that time -
1) depends on its initial velocity
2) is independent of its initial velocity
3) increases linearly with time
4) depends on its initial displacement
Q. The raw materials used for the manufacture of Portland cement are -
1) Lime, silica and Sulphur dioxide
2) Lime, silica and carbon dioxide
3) Lime, silica and alumina
4) Lime, silica and boric acid
Q. Which one of the following statements about diamond and graphite is not correct?
1) Diamond has a tetrahedral structure, whereas graphite has a hexagonal planar structure
2) Both physical and chemical properties of diamond and graphite are different
3) Graphite is soft but diamond is hard
4) Graphite is a good conductor of electricity while diamond is not
Q. Which one of the following statements is correct?
1) Both boiling and evaporation are surface phenomena
2) Boiling is a surface phenomenon, but evaporation is a bulk phenomenon
3) Both boiling and evaporation are bulk phenomena
4) Boiling is a bulk phenomenon, but evaporation is a surface phenomenon
Q. Which one of the following statements about glass is not correct?
1) Glass is often said to be a supercooled liquid
2) Glass has no definite melting point
3) Soda glass is harder than Pyrex glass
4) Boron is present in Pyrex glass
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