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1. Which of the following is not a fundamental unit?
2. The dimensional formula for kinetic energy isa) [M L2 T-1] b) [M L-1 T2]c) [M L2 T-2]d) [M L-2 T-2]
3. The number of significant figures in 4.690×103 isa) 3 b) 4c) 7 d) 6
4. The area under velocity-time graph givesa) distance travelled b) displacementc) accelerationd) deceleration
5. The acceleration of a body having displacement y=-5t3+2t-65 isa) -15t b) -15t2c) -30td) -30t2
a) 0º b) 90ºc) 180ºd) 45º
7. The trajectory of a body fired at an angle to the horizontal follows aa) circular path b) parabolic pathc) hyperbolic pathd) elliptical path
9. SI unit of magnetic flux isa) Weberb) Ohmc) Tesla d) Voltage
10. The peak voltage of an ac supply is 440 V, then its rms voltage isa) 31.11V b) 311.1Vc) 41.11V d) 411.1V
11. Which of the following statements is correct regarding the photoelectric experiment?a) The photocurrent increases with intensity of light. b) Stopping potential increases with increase in intensity of incident light. c) The photocurrent increases with increase in frequency. d) All of these
12. A laser beam is used for locating distant objects becausea) it is monochromatic b) it is not chromatic c) it is not observed d) it has small angular spread
13. For a total internal reflection, which of the following is correct?a) Light travel from rarer to denser medium. b) Light travel from denser to rarer medium. c) Light travels in air only. d) Light travels in water only.
14. The breaking stress of a wire depends ona) material of the wire b) length of the wire c) radius of the wire d) shape of the cross section
15. Which one of the following is not a periodic motion?a) Rotation of the earth about its axis.b) A freely suspended bar magnet displaced from its N-S direction and released.c) Motion of hands of a clock.d) An arrow released from a bow
16. The sound waves travel fastest in:a) liquids b) solidsc) gases d) vacuum