Q. Which of the following can produce a virtual image which is always smaller than the object ?
1) a plane mirror
2) a convex lens
3) a concave lens
4) a concave mirror
Q. The resistance of a conductor depends upon -
1) its length
2) its cross-sectional area
3) its temperature
4) all of the given options
Q. The order of colours in a rainbow from lower edge to top edge is -(Here R = Red, O = Orange, Y = Yellow, G = Green, B = Blue, I = Indigo, V = Violet)
1) ROYGBIV
2) ROYGVIB
3) VIBGYOR
4) GBIVYOR
Q. Which of the following is not correct for the image formed by a plane mirror ?
1) Image is always virtual
2) Image is always real
3) Image is always erect
4) Size of image is equal to that of object
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
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