Q. When an object is at infinity, the position of the image formed by a concave mirror is at -
1) Focus of the mirror
2) Centre of curvature of the mirror
3) Infinity
4) Behind the mirror
Q. The splitting of light into its component colours is called -
1) Reflection
2) Refraction
3) Dispersion
4) Polarization
Q. Xeric condition refers to -
1) low temperature
2) low humidity
3) high evaporation
4) extreme temperature
Q. For which substance among the following, conductivity increases with temperature?
1) Copper
2) Germanium
3) Silver
4) Iron
Q. Name the metal that can be easily cut with a knife :
1) Sodium
2) Copper
3) Aluminium
4) Gold
Q. By which of the following processes are metals of high reactivity extracted from purified molten ore?
1) Reduction by an appropriate reducing agent
2) Calcination
3) Roasting
4) Electrolysis
Q. The reflector of a search light is a :
1) plane mirror
2) cylindrical mirror
3) concave mirror
4) convex mirror
Q. Momentum is measured as the product of :
1) Mass and inertia
2) Mass and velocity
3) Mass and acceleration
4) Mass and force
Q. Negative acceleration is in the opposite direction of :
1) velocity
2) force
3) momentum
4) distance
Q. When a number of resistors are connected in series in a circuit, the value of current :
1) decreases
2) becomes half
3) increases
4) remains the same
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