Q. Which one of the following element's isotopes is used in the treatment of cancer?
1) Uraninum
2) Cobalt
3) Sodium
4) Iodine
Q. The atomic mass of an element is equal to the sum of the number of -
1) electrons and protons only
2) protons and neutrons only
3) electrons and neutrons only
4) electrons, protons and neutrons
Q. Neutrons were discovered by -
1) James Chadwick
2) Ernest Rutherford
3) J. J. Thomson
4) John Dalton
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. The 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 kWh of energy = Rs. 4)
1) Rs. 600
2) Rs. 6,000
3) Rs. 1,200
4) Rs. 1,500
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. Chandrasekhar
Q. Light enters the eye through a thin membrane called -
1) Retina
2) Cornea
3) Pupil
4) Iris
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) Polarisation of light
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. In which of the following years were passenger trains introduced in England?
1) 1823
2) 1825
3) 1848
4) 1861
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