Q. Food cans are coated with tin and not zinc because -
1) Zinc is costlier than tin
2) Zinc has a higher melting point than tin
3) Zinc is more reactive than tin
4) Zinc is less reactive than tin
Q. Which metal is used for making the filaments of electric bulbs?
1) Tungsten
2) Copper
3) Silver
4) Brass
Q. Which of the following statements is/ are correct about 'Bar Magnet'?
I. The Bar Magnet is a permanent magnet.
II. The strength of a permanent magnet cannot be changed.
III. A permanent magnet produces a comparatively weak force of attraction.
Correct code is -
1) Only I
2) Only I and II
3) I, II, III all
4) None of the above
Q. The correct relation between the radius of curvature R and focal length f of a spherical mirror is -
1) R = f
2) R = 2f
3) R = 3f
4) R = 4f
Q. A lemon kept in water in a glass tumbler appears to be larger than its actual size. It is because of -
1) reflection of light
2) scattering of light
3) refraction of light
4) polarization of light
Q. Name the scientist who first used a glass prism to obtain the spectrum of sunlight -
1) C. V. Raman
2) Lord Rayleigh
3) Isaac Newton
4) S. Chandrashekhar
Q. This cost of energy to operate an industrial refrigerator that consumes 5 kW power working 10 hours per day for 30 days will be -
(Given that the charge per kW.h of energy = Rs. 4)
1) Rs. 600
2) Rs. 6,000
3) Rs. 1,200
4) Rs. 1,500
Q. Which one of the following statements regarding magnetic field is not correct?
1) Magnetic field is a quantity that has direction and magnitude
2) Magnetic field lines are closed curves
3) Magnetic field lines are open curves
4) No two magnetic field lines are found to cross each other
Q. Which one of the following types of radiations has the smallest wavelength?
1) Microwaves
2) Infra-red
3) Visible light
4) X-rays
Q. The instrument used for detecting the presence of electric current in a circuit is -
1) Refractometer
2) Galvanometer
3) Viscometer
4) Diffractometer
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