121.Which of the of the following is a measurement taken with Venier callipers?
- A. 2.0 cm
- B. 2.00 cm
- C. 2.000 cm
- D. 2.0000 cm
122.. Which of the units of the following physical quantities are derived? I. Area II. Thrust III. Pressure IV. Mass.
- A. I, II, III and IV
- B. I, II and III only
- C. I, II and IV only
- D. I and II only
123.Which one of the following situations is not possible?
- A. A body has zero velocity and non-zero acceleration
- B. A body travels with a northward velocity and a northward acceleration
- C. A body travels with a constant velocity and a time-varying acceleration
- D. A body travels with a constant acceleration and a time-varying velocity
124.If C is the thermal capacity of a material of mass m and S is its specific heat capacity, then
- A. C = s/m
- B. S = Cm
- C. C = Sm
- D. DS = m/s
125.A black car can be more uncomfortably hot on a warm day than a white car because
- A. it is hot on a warm day
- B. a black object is a better absorber of heat
- C. black cars have heaters installed in them
- D. white cars have air conditioning systems installed in them
126.A little sag is left in overhead telephone wires
- A. because taut wires do not conduct sound easily
- B. to allow for the effect of a rise in temperature due to heating effect of current flowing through them
- C. to allow for the effect of a rise in temperature of the surrounding atmosphere
- D. to allow for the effect of a fall in temperature of the surrounding atmosphere
127.A piece of copper wire of length 100 cm at 30° C is heated to 120° C. If its linear expansivity is 1.8 ×10⁻⁴ / k, its new length is
- A. 166.6 cm
- B. 101.6 cm
- C. 180.6 cm
- D. 1.08 cm
128.A sample of a monatomic ideal gas is originally at 20 °C. What is the final temperature of the gas if both the pressure and volume are doubled?
- A. 5 °C
- B. 80 °C
- C. 20 °C
- D. 899 °C
129.A volatile liquid used for cooling purpose in refrigerator is
- A. liquid ammonia
- B. cold water
- C. liquid nitrogen
- D. liquid helium
130.Complete the following statement: A temperature decrease of 30° C is equal to a temperature decrease of
- A. 30° F
- B. 17° F
- C. 30 K
- D. 86° F
131.Complete the following statement: Bimetallic strips used as adjustable switches in electric appliances consist of metal strips that must have different
- A. mass
- B. volume
- C. length.
- D. expansion coefficients
132.Heat can be transferred from one end of a metal rod in contact with heat to the other end which is in contact with heat through
- A. Conduction
- B. Convection
- C. Radiation
- D. Evaporation
133.Heat supplied or removed from a system which causes a change of state without a change in temperature is
- A. Specific heat
- B. Heat capacity
- C. Latent heat
- D. Boiling heat
134.How many atmospheres of pressure must a litre of gas, initially at a pressure of 1 atmosphere and temperature -20° C, be after it has been compressed to ½ litre at 40° C?
- A. 2.47 atm
- B. 4.5 atm
- C. 8.0 atm.
- D. 3.8 atm
135.On a cold day, a good conductor X feels colder to the torch than a poor conductor Y because
- A. Y retains more heat than X
- B. the temperature of X is lower than that of Y
- C. X conducts heat from the body less rapidly than Y
- D. X transfers heat from body more rapidly than Y
136.The boiling point of water does not depend on
- A. the impurities in water
- B. the external pressure
- C. the quantity of water
- D. all of the above
137.The ice and steam points of a local liquid in glass thermometer are 10 a and 90a respectively. What will the thermometer read when the temperature is 30 ° C ?
138.The lower and upper fixed points on a thermometer are 40 and 120 respectively. Its reading at 60° C is
139.The pressure exerted by a given mass of gas in a container
- A. Decreases if the container is heated
- B. Increases if the molecules of the gas move faster
- C. Increases if the volume of the container is doubled
- D. Decreases as the kinetic energy of the gas molecules increases
140.The temperature in an electric iron is regulated by
- A. thermometer
- B. bimettalic strip
- C. steel
- D. conductor