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. How many covalent bonds are present in a Chloropropane molecule having molecular formula, C3H7Cl?
1) 6
2) 8
3) 9
4) 10
Q. Which one of the following is the most fundamental characteristic of an element?
1) Melting point
2) Atomic number
3) Colour
4) Atomic weight
Q. Neutrons were discovered by -
1) James Chadwick
2) Ernest Rutherford
3) J. J. Thomson
4) John Dalton
Q. Atomic mass of an element is equal to the sum of number of -
1) electrons and protons only
2) protons and neutrons only
3) electrons and neutrons only
4) electrons, protons and neutrons
Q. Which one of the following element's isotope is used in the treatment of cancer?
1) Uranium
2) Cobalt
3) Sodium
4) Iodine
Q. Which one of the following cell organelles may play a role in expelling excess water and wastes in case of unicellular organisms?
1) Lysosome
2) Vacuole
3) Golgi body
4) Endoplasmic reticulum
Q. Which one of the following terms describes the practice of growing two or more crops simultaneously on the same piece of land?
1) Crop rotation
2) Mixed cropping
3) Intercropping
4) Mixed farming
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