Physics : PRE Medical Entrance Question Bank
(Paper - 7)

1. A small spherical lead shot is dropped into a highly viscous liquid. Then it
A. goes down with constant acceleration
B. first accelerates and then has constant velocity
C. has uniform retardation
D. has constant velocity at first and then accelerates

2. A soap bubble of radius r is blown till its diameter is trebled. What is the energy required to do this?
A. 4pr²s
B. 64pr²s
C. 32pr²s
D. 24pr²s

3. A strip of rubber 8 cm long is stretched until it is 10 cm long. What is the tensile strain?
A. 0.25
B. 0.30
C. 0.20
D. 0.35

4. A bimetallic strip consists of brass and iron. When it is heated, it bends into an arc with brass on the convex side of the arc while the iron is on the concave side. This is because
A. iron has a larger linear expansivity than brass
B. brass has a larger linear expansivity than iron
C. density of brass is less than that of iron
D. specific heat capacity of brass is less than that of iron

5. How many joules of heat are required to completely convert 10 kg of ice at 0oC to water at the same temperature?
A. 3.36 X 10⁸ J
B. 3.36 X 10⁶ J
C. 3.36 X 10⁴ J
D. 3.36 X 10⁵ J

6. Which one of the following is most suitable to measure very high temperatures?
A. Mercury thermometer
B. Pyrometer
C. Platinum resistance thermometer
D. Thermoelectric thermometer

7. What are the dimensions of E in the relation E = sT4?
A. ML⁰T-³
B. M²L²T^-4
C. M⁰L⁰T²
D. M⁰L¹T^-3

8. Keeping the temperature constant, the pressure of a certain mass of a gas is decreased to a very low value. Then its mean free path
A. will not be affected
B. will increase
C. will decrease
D. will increase or decrease depending upon the gas

9. A Carnot engine working between 300 K and 1000 K has an output of 1400 J per cycle. The heat energy absorbed from the source per cycle is
A. 1500 J
B. 700 J
C. 2000 J
D. 800 J

10. The following four gases are at the same temperature and pressure. Which gas molecule will have the highest root mean square velocity?
A. Hydrogen
B. Neon
C. Helium
D. Oxygen

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