Motion in A Straight Line MCQ for NEET. We covered all the Motion in A Straight Line MCQ for NEET in this post for free so that you can practice well for the exam.
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MCQ on Motion in A Straight Line for NEET Students
The color of a star depends upon its ………
(A) density
(B) distance from the sun
(C) radius
(D) surface temperature
Option d – surface temperature
If Q, E, and W denote the heat added, change in internal energy, and the work done in a closed cyclic process respectively, then
(A) W = 0
(B) Q = W = 0
(C) E = 0
(D) Q = 0
Option c – E = 0
If the mean free path and average velocity of molecules in a gas are I and v respectively, then the frequency of collisions is given by
(A) v²/ l
(B) v/l²
(C) v/l
(D) l/v
Option c – v/l
If the temperature of the source and the sink of the Carnot engine is increased by the same amount, then the efficiency of the engine
(A) will increase.
(B) will remain the same.
(C) will decrease.
(D) can not be predicted with the help of the given information.
Option c – will decrease.
A certain quantity of water cools from 70 °C to 60 °C in the first 5 minutes and to 54 °C in the next 5 minutes. The temperature of the surroundings is
(A) 45 °C
(B) 20 °C
(C) 50 °C
(D) 30 °C
Option a – 45 °C
A refrigerator absorbs 3000 cal of heat from ice trays. If the coefficient of performance is 4, then the work done by the motor is
(A) 3150 J
(B) 4200 J
(C) 5000 J
(D) 8400 J
Option a – 3150 J
If the temperature of a hot body is increased by 10%, the amount of radiation emitted by it would increase by nearly
(A) 10%
(B) 54%
(C) 46%
(D) 10000%
Option c – 46%
Sealed gas containers kept in vehicles are a having uniform speeds. The temperature gas molecules inside will
(A) remain the same.
(B) increase.
(C) decrease increase for some, while others.
(D) decrease.
Option a – remain the same.
A hollow sphere and a solid sphere of the same material and size are heated to the same temperature and allowed to cool in the same surrounding. If the temperature difference between each sphere and its surrounding is T, then
(A) the hollow sphere will cool at a faster rate for all values of T.
(B) the solid sphere will cool at a faster rate for all values of T.
(C) both spheres will cool at the same rate for all values of T.
(D) both spheres will cool at the same rate only for small values of T.
Option a – the hollow sphere will cool at a faster rate for all values of T
150 g of water is heated from 30 °C to 60 °C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K)
(A) 4.2 kJ
(B) 18.8 kJ
(C) 9.2 kJ
(D) 2.1 kJ
Option b – 18.8 kJ
If we travel from the earth’s surface to the mesosphere, the mean free path of the air molecules
(A) is considerably decreased.
(B) is considerably increased.
(C) becomes zero.
(D) does not change.
Option b – is considerably increased.
A Carnot engine has an efficiency of 30%. The energy is supplied to the engine at the rate of 2 kW. What is the output power of the engine?
(A) 300 W
(B) 600 W
(C) 500 W
(D) 400 W
Option b – 600 W
In an ideal gas, the total energy of the molecules includes
(A) only potential energy.
(B) only gravitational energy.
(C) only kinetic energy.
(D) both potential as well as kinetic energy.
Option c – only kinetic energy.
A Carnot engine first works between 0 °C and -100 °C and then between 100 °C and 0 °C. What is the ratio of its efficiency in these two cases?
(A) 0.51
(B) 1.63
(C) 1.36
(D) 0.85
Option c – 1.36
Which statement is NOT true for an ideal gas?
(A) It obeys Boyle’s law.
(B) It follows PV = RT.
(C) Internal energy depends on temperature only.
(D) It follows Van der Waal’s equation.
Option d – It follows Van der Waal’s equation.
One mole of a gas at pressure 2 Pa and temperature 47 °C is heated till both pressure and volume are doubled. What is the temperature of the gas?
(A) 300 K
(B) 640 K
(C) 900 K
(D) 1280 K
Option d – 1280 K
The three liquids of equal mass A, B, and C of specific heats SA, SB, and Sc respectively are being cooled under identical circumstances. If Sc < SB < SA, then for which liquid will the time taken to cool through the same temperature difference be maximum?
(A) For C
(B) For B
(C) For A
(D) All liquids will take the same time.
Option c – For A
The density of a certain mass of a gas at S.T.P. is p. If the pressure of the gas becomes 3 times and the temperature is made half of its initial value, the new density will be
(A) 3 p
(B) 4.5 p
(C) 6 p
(D) 9 p
Option c – 6 p
A thermos flask contains 250 g of coffee at 90 °C. To this 20 g of milk at 5 °C is added. After equilibrium is established, the temperature of the liquid is (Assume no heat loss to the thermos bottle. Take specific heat of coffee and milk as 1.00 cal/g °C)
(A) 3.23 °C
(B) 3.17 °C
(C) 83.7 °C
(D) 37.8 °C
Option c – 83.7 °C
A gas in an enclosure has a pressure of ‘P’ and a temperature of ‘T’ K. Another gas enclosed in a container of the same volume has a pressure of 2P’ and a temperature of ‘T/4’ K. The ratio of the number of molecules per unit volume of the two gases is
(A) 1 : 4
(B) 1 : 8
(C) 1 : 2
(D) 1:16
Option b – 1 : 8
A liquid with a certain surface area takes 5 minutes to cool from 80 °C to 70 °C. The time taken by it to cool from 80 °C to 60 °C is (The surrounding temperature being 40 °C)
(A) 9.4 minutes
(B) 10 minutes
(C) 11 minutes
(D) 11.6 minutes
Option d – 11.6 minutes
Two vessels A and B are identical. A has 1 g hydrogen at 0 °C and B has 1 g oxygen at 0 °C. Vessel A contains x molecules and B contains y molecules. The average kinetic energy per molecule in A is ‘m’ times the average kinetic energy per molecule in B. The value of m is
(A) 16
(B) 8
(C) 32
(D) 1
Option d – 1
Two vessels of different materials are identical in their physical dimensions. The same quantity of ice filled in them gets melted in 20 minutes and 30 minutes. The ratio of their thermal conductivities will be
(A) 3 : 2
(B) 1 : 1
(C) 2 : 3
(D) 4 : 1
Option a – 3 : 2
The internal energy of the monoatomic ideal gas is 1.5 nRT. One mole of helium is kept in a cylinder of cross-section 16.2 cm². The cylinder is closed by a light frictionless piston. The gas is heated slowly in a process during which a total of 98.2 J heat is given to the gas. If the temperature rises through 4 °C, find the distance moved by the piston. (Take atmospheric pressure = 100 kPa and R = 8.3 J/mol K).
(A) 15 cm
(B) 20 cm
(C) 25 cm
(D) 30 cm
Option d – 30 cm
The total random kinetic energy of the molecules in 1 mole of a gas at a temperature of 400 K is (R = 2 cal/mol °C)
(A) 450 cal
(B) 600 cal
(C) 1200 cal
(D) 2250 cal
Option c – 1200 cal
The ratio of the diameters of two metallic rods of the same material is 3 : 1 and their lengths are in the ratio 1 : 9. If the temperature difference between their ends is equal, the rate of flow of heat in them will be in the ratio
(A) 1:81
(B) 1:27
(C) 27 : 1
(D) 81 : 1
Option d – 81 : 1
Which of the following is an example of an ideal black body?
(A) Kajal
(B) Blackboard
(C) A pinhole in a box
(D) Lamp black
Option c – A pinhole in a box
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