Q. A metallic wire having resistance of 20ω is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to -
1) 20ω
2) 10ω
3) 5ω
4) 15ω
Q. Two planets orbit the Sun in circular orbits, with their radius of orbit as R1= R and R2 = 4R. Ratio of their periods (T1T2) around the Sun will be -
1) 1/16
2) 1/8
3) 1/4
4) 1/2
Q. Which one of the following is NOT the unit of energy?
1) Joule
2) Watt-hr
3) Newton-metre
4) kg-metre/sec2
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. 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. 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. Which of the following statements is NOT correct regarding the travel of sound waves?
1) Sound waves can travel through water
2) Sound waves can travel through the air
3) Sound waves can travel through steel
4) Sound waves can travel through the vacuum
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