Q. A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
1) The lens is concave and has a focal length of 0.5 meter
2) The lens is convex and has a focal length of 2.0 metre
3) The lens is convex and has a focal length of 0.5 meter
4) The lens is concave and has a focal length of 2.0 meters
Q. The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is -
1) Reflection
2) Total internal reflection
3) Scattering
4) Interference
Q. The instrument used for detecting the presence of electric current in a circuit is -
1) Refractometer
2) Galvanometer
3) Viscometer
4) Diffractometer
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. When the short circuit condition occurs, the current in the circuit -
1) becomes zero
2) remains constant
3) increases substantially
4) keeps on changing randomly
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
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