Physics MCQs

MCQs Physics Ch. 2,3,4 & 5 1.

A physical quantity which is completely described by its magnitude only is called a. Vector b. Scalar c. Constant d. Variable 2. The direction of a vector is a plane is denoted by the angle with the representative line of vector makes with positive x-axis in the a. Anti clock wise direction b. Clock wise direction c. Upward direction d. down ward direction 3. a vector having zeroz magnitude and direction are called a. rectangular componenets b. equal vectors c. addition of vector d. all 4. unit vector is used to describe a. direction of a vector b. angle of a vector c. magnitude of a vector d. position of a vector 5. conventionally anti clock wise torque is taken as a. positive b. zero c. negative d. maximum 6. displacement is a. a scalar quantity b. vector quantity c. fixed quantity d. constant quantity 7. if a particle is moving with constant speed in a circle then its a. velocity is uniform b. velocity is changing c. acceleration is decreasing d. instantananeous velocity 8. the product of mass of a particle and its velocity is called a. force b. energy c. acceleration d. linear momentum 9. in an ideal gas when no K.E. is lost the collision is said to be: a. elastic b. inelastic c. perfectly elastic d. perfectly inelastic 10. in presence of aerodynamical force the high and range of projectile will _____________from ideal path a. increases

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b. decreases c. un effected d. none of these work is a a. scalar quantity b. vector quantity c. fixed quantity d. none of them the work done will be negative if the force and displacement are a. opposite to each other b. parallel to each other c. perpendicular to each other d. none of them the unit of energy is the same as that of a. force b. velocity c. work d. power biofuels such as ethanol is a replacement of a. gasoline b. water c. oil d. all geysers derives its energy from the a. mountains b. sun c. moon d. earth the direction of angular acceleration is a. along the axis of rotation b. away the axis of rotation c. perpendicular to axis of rotation d. all when body is moving in a circle then direction of its linear velocity is a. along the radius of circle b. away from radius of circle c. tangent to circle d. none of these when a body is moving in a circle then its tangential velocity a. remains constant b. changes continuously c. becomes zero d. none for a car moving round a corner track necessary centripetal force is provided by a. frictional force b. normal reaction c. both a&b d. gravitational force the moment of inertia plays the same role in angular motion as the mass in a. angular motion b. linear motion c. rotational motion d. all