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1226/21, 3.44 PM, , , , , , Date, -26/12/2021, WAGHMODE PHYSICS ACADEMY, Exam Name -KTG Time -60 Minutes, a Mark = 25, 1, Which of the substances P, Q or R has the lowest specific heat ? The temperature w/s time graph is Shown, gl Q, R, p Time, {a)P (b)Q, ()R (d) iN 5. heat, 2. Which one of the following graph bs correct oe, ‘t—, (a), w=, , = §, , , , * Ns s, w3. The mean kinetic et ule per a, (a) L2KT Ws Y (b) 3/2 RT, , (c) 2 RT (d) 3/2 KT, 4. The mean wad wily o Nn of velocities are 2 m/s, 3 m/s, 4 m/s, 5 ms and 6 ms respectively, is, (a) ons C \ (b) 4 (avs?, (6) 18 (ms? (d) 16 (m/s, 5. ‘The translational Kinetic energy of the molecules of a gas at absolute temperature (‘T) can be doubled by[MHTCET 2020], (a) ncreasing T to Y2T (b) ncreasing T to 2T, (c) decreasing T to T/2 (d) ncreasing T to 4T, 6 ‘The ratio of the specific heats 2 = Y interms of degrees of treedom'n 1s given by[MHT-CET 2020], 1 2, (a) (1 ++) (b) (1 +=), a, (145) (1 +5), , Hitps:Mestplannors comtrachoradnintnstprmcet1 php
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1226/21, 3.44 PM , 7., , 12., , 13., , 14,, , 16., , 17,, , , , ‘The root mean square velocity of mokcules ofa gas s 200 m/s. What will be the root mean square velocity of, the molecules, ifthe molecular weight is doubled and the absolute temeprature ts halved? [MHT-CET 2020], (a) <2 m/s (b) 100 m/s, (¢) 200 m/s (d) 50 m/s, Let' a’ and ' " be Stefarls cosntant and Wien's constant respectively, then dimensions of" ¢ b', are[MHT-CET 2020], (a) PtTeK- (b) Mt T-3K-2, () UM T K-3 (d) bat K-8, For athermanous substances, coefficient of transmission | MHT-CET 2020], (a) equal to one (b) zero, (c) less than one but greater than zero (d) greater than one, For a gas = = 0.67 . This gas is made up of mokcule which are[MHT-CET 2020], (a) polyatomic (b) mixture of) 2 and polyatomic, (c) monoatonuc (d) di, If’ £' is the number of degrees of freedom ofa molecu of ratio of molar specific heats ofa gas,, y=1 +3 where ¥ = Cp/Cv, ‘The ratio of" y' for mo gas to' y'' for (rigid) diatomic gas s[MHT-CET, 2020], is, (a= Q! =, 2 23, WZ x) @>, At constant pressure, which of the ag | MHT CET 2005], (aye Jo Oo (yee, i, (eyo Xp = a\ (aye & ae, ‘What is an ideal gas?| -GET 2, (a) One that c cuks (b) A gas satisfying the assumptions of kinetic theory, (c) A gas having lian ion of speed (d) A gas consisting of massless particles, ‘The unit of W b -CET 2009], (a) (b) m=! K~*, (c) Wm? ( (d) m-k, In the expres nog law, the product PV" has dimensions off MHT-CET 2015], (a) force (b) mpulse, (c) energy (d) momentum, For an deal gas, (a) C, is less than CG, (b) C, is equal to Cy, (c) C, is greater than C, (dc, =C, =0, ‘The root mean square velocity of gas molecules at 27 °C is 1365 ms~*. The gas is, (a) 0, (b) He, , Hitps:Mestplannors comtrachoradnintnstprmcet1 php
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12;26/21, 344 PM, , (©) N, (d) co,, , , , , , 18. ‘Temperature remaining constant, the pressure of gas & decreased by 20%, The percentage change in volume, (a) Increases by 20% (b) Decreases by 20%, (c) Increases by 25% (d) decreases by 25%, 19. Six mokcules speeds 2 unit, 5 uni, 3 unit, 6 unit, 3 uni, and 5 unit respectively. The rms speed is, (a) 4 uni (b) 1.7 unit, (c) 4.2 unt (d) 5 unit, 20. Which one of the following graphs represents the behaviour of an ideal gas?, tt t, ie pr, (a) \ (b), —, 4, t / t ©, pr . py, © J, 7, i $s —, 21, Athermanous bodies are those :, (a) Which do not allow heat radiation to (b) Which allow heat radiation to pass through, (c) Which are special type of black me ) (d) Which are insulators, 22. The best ideal black body is :, (a) Lamp of charcoal heated to (b) Metal coated with a black dye, (©) Ghss surf (d) Hollow enclosure blackened inside and having a, 23., , , , small hole., Dimensions 105 Arn), (a) (MLT=] PP (b) [(M'L'T~], M’ (& [MLUT“K'], n two bodies is determined by, (b) total energy, , (d) the difference in the average kinetic energy of the, molecuks in random motion., , Ifthe volume ofan ideal gas decreased by 5% at constant temperature, the ncrease of pressure &, (a) 5% (b) 5.18 %, (c) 5.26% (d) 5.41%, , Hitps:Mestplannors comtrachoradnintnstprmcet1 php
