# Physics Test

Jun 17th, 2015
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1. A body is moving with a speed 1 m/s and a force F is needed to stop it in a distance x. If the speed of the body is 3 m/s the force needed to stop it in the same distance x will be A) 1.5 F (B) 3 F (C) 6 F (D) 9 F 2 Two perfect gases at absolute temperatures are mixed. There is no loss of energy.

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Section - 1Physics1.A body is moving with a speed 1 m/s and a force F is needed to stop it in a distance x. If the speed of the body is 3 m/s the force needed to stop it in the same distance x will be (A) 1.5 F(B) 3 F (C) 6 F(D) 9 F 2Two perfect gases at absolute temperatures are mixed. There is no loss of energy. The temperature of the mixture if the masses of the molecules are and the number of molecules in the gases are (both gases are of same nature) (A) (B) (C) (D) none of these 3Three rods made of same material and having the same cross-section have been joined as shown in figure. Each rod is of the same length. The left and right ends are kept at 0C, 90 & 60. The temperature of the junction of the rods will be (A) 45C(B) 50C (C) 55C(D) 60 4An ideal gas is taken through the cycle as shown in figure . If the heat supplied to the gas in the cycle is 5J. The work done by the gas in the process is (A) - 25 J(B) - 10 J (C) - 15 J(D) - 20 J 5Light from source consists of two wavelength . If D = 2m and d = 6.5 mm. The minimum value of y where the minima of both the wave lengths coincide.(A) 0.1 mm(B) 0.2 mm (C) 0.3 mm(D) 0.4 mm 6An isolated hydrogen atom emits a photon of 10.2 eV recoil speed of hydrogen atom (A) 3.25 m/s(B) 3 m/s (C) 6.2 m/s(D) 1 m/s 7The X-ray emission line of kingsten occurs at . The energy difference between K & L l

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