>>>PHYSICS TEST total m.c.q 25 max marks =125 first three unit from U.H.S 1.Suppose A = BC, where A has the dimension L/M and C has the dimension L/T. Then B has the dimension: A. T/M B. L2/TM C. TM/L2 D. L2T/M 2. The dimensional formula for impulse is (a) [MLT−2] (b) [MLT−1](c) [ML2T−1] (d)[M2LT−1] 3. The unit of power is : (a) Kilowatt (b) kilowatt-hour (c) dyne (d) Joule 4.Light year is approximately : (a) 9.46 × 10^15 m (b) 3 × 10^8 m(c) 9.46 × 10^−15 m (d) 3 × 10^−8 m 6.The term “mass” refers to the same physical concept as: A. weight B. inertia C. force D. acceleration 7.A man weighing 700 N is in an elevator that is accelerating upward at 4m/s2. The forceexerted on him by the elevator floor is: (A.) 71N (B.) 290N (C.) 410N (D.)980N 8. A thin circular hoop of mass 1.0 kg and radius 2.0m is rotating about an axis through its center and perpendicular to its plane. It is slowing down at the rate of 7.0 rad/s2. The net torqueacting on it is: (A.) 7.0N N m (B.) 14.0N N m (C.) 28.0N N m (D.) 44.0N N m. 9.A fluid is undergoing “incompressible” flow. This means that: A. the velocity at a given point cannot change with time B. the velocity must be the same everywhere C. the pressure must be the same everywhere D. the density cannot change with time or location 10 .fluid is undergoing steady flow. Therefore: A. the velocity of any given molecule of fluid does not change B. the pressure does not vary from point to point C. the velocity at any given point does not vary with time D. the density does not vary from point to point 11.The dimensions of calorie are (a) [ML2T−2] (b) [MLT−2](c) [ML2T−1] (d) [ML2T−3] 12. Which of the following is not represented in correct unit (a) Stress = N ⁄ m2(b) Surface tension = N / m(c) Energy = kg-m/sec(d) Pressure = N ⁄ m2 13. The dimensional formula for r.m.s. (rootmean square) velocity is (a) [M^0LT^−1] (b) [M^0L^0T−2] (c) [M^0L^0T^−1] (d) [MLT−3] 14. substances that do not flow easily have (a)small coefficient of viscosity (b) large coefficient of viscosity (c) extremely small coefficient of viscosity (d)no value of coefficient 15. At high speeds the drag force is not longer simply proportional to (a)mass of the body (b)speed of the body (c)density of the body (d)volume of body 16. Whose famous theories were based upon abstract arguments rater than experimental evidence a)Euclid b)Aristotle c)plato d)Pythagoras 17.Net force acting on a droplet is given as a)weight-drag force b)drag force-weight c)weight + drag force 18. Acceleration of a droplet is given by the relation a)a=g+6pinrv/m c) a= g-6pinr/mv c)a=g-6pinrv/m d)a= g-6pinmv/r 19. A same fluid is flowing through two pipes ia Area of a pipe is 20 m(sq.) and its velocity is 5m/s and the area of other pipe is 50m(sq) then its velocity will be a)2m/s b)4m/s c)2.5m/s d)1m/s 20.The dimension of coefficient of viscosity is a)[ML^2T^1] b)[M^2L^1T^1] (c)[ML^-1T^-1] (d) none 21. systolic pressure is called a)low B.P b) high B.P c)normal B.P d)abnormal B.P 22. A chimney works best if the air exposed to the chimney is a)stationary b)moving c)moving slowly d)moving fastly 23.Bernoullis equation is applicable for a)Laminar flow b)turbulent flow c)both a&b d)none of these 24. A man weighs 600 N while on the surface of Earth. If he is transported to the planet Mythos, which has the same mass as Earth but a radius that is twice as large as Earth’s, his weight would be A. 1200 N.B. 600 N.C. 300 N.D. 150 N. 25. Six identical physics books, each with mass 2.0 kg, are taken to the Moon. On the Moon,their combined mass is A. zero. B.) 2.0 kg . C). 6.0 kg .D.) 12 kg.
Posted on: Thu, 01 Aug 2013 09:24:03 +0000
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