1. How many significant figures are there in the number 0.0450?
2. An object is positioned in a gravitational field. The measurement of gravitational force acting on the object has an uncertainty of 3 % and the uncertainty in the mass of the object is 9 %.What is the uncertainty in the gravitational field strength of the field?
A. 3 %
B. 6 %
C. 12 %
D. 27 %
3. The variation of the displacement of an object with time is shown on a graph. What does the area under the graph represent?
A. No physical quantity
4. An object is thrown upwards. The graph shows the variation with time t of the velocity v of the object.
What is the total displacement at a time of 1.5 s, measured from the point of release?
A. 0 m
B. 1.25 m
C. 2.50 m
D. 3.75 m
5. An object is released from a stationary hot air balloon at height h above the ground.An identical object is released at height h above the ground from another balloon that is rising at constant speed. Air resistance is negligible. What does not increase for the object released from the rising balloon?
A. The distance through which it falls
B. The time taken for it to reach the ground
C. The speed with which it reaches the ground
D. Its acceleration
6. The diagram shows the forces acting on a block resting on an inclined plane. The angle h is adjusted until the block is just at the point of sliding. R is the normal reaction, W the weight of the block and F the maximum frictional force.
What is the maximum coefficient of static friction between the block and the plane?
A. sin h
B. cos h
C. tan h
7. A system that consists of a single spring stores a total elastic potential energy Ep when a load is added to the spring. Another identical spring connected in parallel is added to the system.The same load is now applied to the parallel springs.
What is the total elastic potential energy stored in the changed system?
8. A moving system undergoes an explosion. What is correct for the momentum of the system and the kinetic energy of the system when they are compared immediately before and after the explosion?
9. What does the constant n represent in the equation of state for an ideal gas pV = nRT ?
A. The number of atoms in the gas
B. The number of moles of the gas
C. The number of molecules of the gas
D. The number of particles in the gas
10. A 1.0 kW heater supplies energy to a liquid of mass 0.50 kg. The temperature of the liquid changes by 80 K in a time of 200 s. The specific heat capacity of the liquid is 4.0 kJ kg–1 K–1. What is the average power lost by the liquid?
B. 200 W
C. 800 W
D. 1600 W