Motion in A Straight Line MCQ for NEET

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    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

    What determines the color of a star?

    (A) density

    (B) distance from the sun

    (C) radius

    (D) surface temperature

    Option d – surface temperature

    In a closed cyclic process involving heat (Q), internal energy change (E), and work (W), which of the following holds true?

    (A) W = 0

    (B) Q = W = 0

    (C) E = 0

    (D) Q = 0

    Option c – E = 0

    If a gas has mean free path I and average molecular speed v, how is the collision frequency expressed?

    (A) v² / l

    (B) v / l²

    (C) v / l

    (D) l / v

    Option c – v / l

    When both the source and sink temperatures of a Carnot engine are raised by the same amount, what happens to its efficiency?

    (A) will increase

    (B) will remain the same

    (C) will decrease

    (D) cannot be determined from the given data

    Option c – will decrease

    A sample of water cools from 70 °C to 60 °C in the first 5 minutes and then to 54 °C in the next 5 minutes. What is the surrounding temperature?

    (A) 45 °C

    (B) 20 °C

    (C) 50 °C

    (D) 30 °C

    Option a – 45 °C

    A refrigerator removes 3000 calories of heat from ice trays. If its coefficient of performance is 4, how much work is done by the motor?

    (A) 3150 J

    (B) 4200 J

    (C) 5000 J

    (D) 8400 J

    Option a – 3150 J

    If the temperature of a hot object increases by 10%, by approximately how much does the radiation emitted increase?

    (A) 10%

    (B) 54%

    (C) 46%

    (D) 10000%

    Option c – 46%

    Gas containers sealed in vehicles moving at constant speed will have gas molecules with what kind of temperature change?

    (A) remain the same

    (B) increase

    (C) vary for some, remain constant for others

    (D) decrease

    Option a – remain the same

    Two identical spheres, one hollow and the other solid, are heated equally and left to cool. Assuming the temperature difference with the environment is T, what is true about their cooling?

    (A) hollow sphere cools faster for all T

    (B) solid sphere cools faster for all T

    (C) both cool at the same rate for all T

    (D) both cool equally only at small T values

    Option a – hollow sphere cools faster for all T

    150 g of water is heated from 30 °C to 60 °C. Assuming no expansion, how much does its internal energy change? (Specific heat = 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

    What happens to the mean free path of air molecules as one moves from the Earth’s surface to the mesosphere?

    (A) greatly decreases

    (B) greatly increases

    (C) becomes zero

    (D) remains constant

    Option b – greatly increases

    A Carnot engine has 30% efficiency and is supplied with energy at a rate of 2 kW. What is the engine’s power output?

    (A) 300 W

    (B) 600 W

    (C) 500 W

    (D) 400 W

    Option b – 600 W

    In an ideal gas, the total energy of its molecules is made up of

    (A) only potential energy

    (B) only gravitational energy

    (C) only kinetic energy

    (D) both kinetic and potential energy

    Option c – only kinetic energy

    A Carnot engine runs between 0 °C and -100 °C, then between 100 °C and 0 °C. What is the ratio of efficiencies in these two operations?

    (A) 0.51

    (B) 1.63

    (C) 1.36

    (D) 0.85

    Option c – 1.36

    Which of the following does not apply to an ideal gas?

    (A) Follows Boyle’s law

    (B) Satisfies PV = RT

    (C) Internal energy depends only on temperature

    (D) Obeys Van der Waal’s equation

    Option d – Obeys Van der Waal’s equation

    One mole of gas at 2 Pa and 47 °C is heated so that both pressure and volume double. What is the final temperature?

    (A) 300 K

    (B) 640 K

    (C) 900 K

    (D) 1280 K

    Option d – 1280 K

    Three equal masses of liquids A, B, and C (with specific heats SA, SB, SC respectively) cool under the same conditions. If SC < SB < SA, which one takes the longest to cool through the same temperature range?

    (A) Liquid C

    (B) Liquid B

    (C) Liquid A

    (D) All take the same time

    Option c – Liquid A

    The density of a gas at S.T.P. is p. If pressure triples and temperature becomes half, what is the new density?

    (A) 3p

    (B) 4.5p

    (C) 6p

    (D) 9p

    Option c – 6p

    A thermos flask holds 250 g of coffee at 90 °C. When 20 g of milk at 5 °C is added, what is the final temperature? (No heat loss, specific heat = 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 has pressure P and temperature T. Another gas at the same volume has pressure 2P and temperature T/4. What is the ratio of molecular number densities?

    (A) 1 : 4

    (B) 1 : 8

    (C) 1 : 2

    (D) 1 : 16

    Option b – 1 : 8

    A liquid cools from 80 °C to 70 °C in 5 minutes. How long will it take to cool from 80 °C to 60 °C in the same environment (temperature = 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 (same size) contain 1 g of hydrogen and 1 g of oxygen respectively at 0 °C. If A has x molecules and B has y molecules, and the average kinetic energy per molecule in A is m times that in B, what is m?

    (A) 16

    (B) 8

    (C) 32

    (D) 1

    Option d – 1

    Two metal vessels of the same dimensions melt identical amounts of ice in 20 and 30 minutes respectively. What is the ratio of their thermal conductivities?

    (A) 3 : 2

    (B) 1 : 1

    (C) 2 : 3

    (D) 4 : 1

    Option a – 3 : 2

    The internal energy of a monoatomic ideal gas is given by 1.5 nRT. One mole of helium is in a cylinder with cross-sectional area 16.2 cm² and heated slowly. If 98.2 J of heat is supplied and temperature rises by 4 °C, how far does the piston move? (Assume atmospheric pressure = 100 kPa, R = 8.3 J/mol·K)

    (A) 15 cm

    (B) 20 cm

    (C) 25 cm

    (D) 30 cm

    Option d – 30 cm

    What is the total kinetic energy of 1 mole of gas at 400 K? (Given: R = 2 cal/mol·°C)

    (A) 450 cal

    (B) 600 cal

    (C) 1200 cal

    (D) 2250 cal

    Option c – 1200 cal

    Two rods of the same material have diameters in a 3:1 ratio and lengths in a 1:9 ratio. If both experience the same temperature gradient, what is the heat flow rate ratio?

    (A) 1 : 81

    (B) 1 : 27

    (C) 27 : 1

    (D) 81 : 1

    Option d – 81 : 1

    Which of the following best resembles 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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