Q. The term refraction of light means -
1) Bending of light rays when they enter from one medium to another medium
2) Splitting of white light into seven colours when it passes through the prism
3) Bending of light round the corners of obstacles and apertures
4) Coming back of light from a bright smooth surface
Q. The working principle of transformer is -
1) Self - induction
2) Mutual induction
3) Electromagnetic induction
4) Lorentz law
Q. After a shower of rain, a rainbow is seen -
1) Even in the absence of the sun
2) opposite the sun
3) towards the sun
4) anywhere, irrespective of the position of the sun
Q. After a shower of rain, a rainbow is seen -
1) Even in the absence of the sun
2) opposite the sun
3) towards the sun
4) anywhere, irrespective of the position of the sun
Q. Which of the following is a semiconductor?
1) Silver
2) Glass
3) Copper
4) Silicon
Q. Which one of the following attributes is not true for uniform circular motion ?
1) The distance is always equal to the displacement
2) Velocity is always perpendicular to the radius of the circle
3) The speed of the body remain constant
4) The velocity of the body is continuously changing
Q. Once a satellite has been launched into orbit, the only force governing its motion is the force of -
1) Gravity
2) Elasticity
3) Friction
4) Fuel driven
Q. Which of the following is not a primary force which influences ocean currents ?
1) Magnetic fields of the earth
2) Heating by the sun
3) Gravity
4) Coriolis Force
Q. Pyrolusite is an ore of ________
1) Manganese
2) Chromium
3) Titanium
4) Uranium
Q. The weight of an object is due to -
1) the net force acting on it
2) the total of all forces acting on it irrespective of their directions
3) the force that it exerts on the ground
4) its inert property
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