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1. Those units, which can neither be derived from one another, nor can they be further resolved into any other units are called
2. Steradian is an example ofa) fundamental units b) derived unitsc) supplementary unitsd) noneDeselect Answer
3. The dimensional formula of Voltage isa) [ML2 T-3 A-1]b) [ML3 T-2 A-1]c) [ML2 T-1 A-3]d) [ML3 T-2 A-2]Deselect Answer
4. If a body changes its velocity in equal intervals of time, it is said to havea) uniform motionb) uniformly accelerated motionc) uniform velocityd) noneDeselect Answer
5. The slope of the position-time graph of an object in uniform motion givesa) displacementb) distancec) velocity d) speedDeselect Answer
6. The distance covered by a body initially at rest, which accelerates to a speed of 144 kmh-1, in 20s isa) 800 m b) 200 mc) 400 m d) 500 mDeselect Answer
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8. For a non-uniform circular motion in a circle of radius r, the angular acceleration α isa) a constant b) 0c) always varying d) noneDeselect Answer
9. A transverse wave consists ofa) only crests b) only troughsc) both crests and troughsd) rarefactions and compressionsDeselect Answer
10. De Broglie wavelength of 0.05 eV thermal neutron isa) 1.3Åb) 2Åc) 5.4Åd) 8ÅDeselect Answer
11. The line that draws power supply to your house from street hasa) 220√2V average voltage.b) 220 V average voltage.c) Voltage and current out of phase by π/2.d) Voltage and current possibly differing in phase ϕ such that |ϕ|<π/2.Deselect Answer
12. A passenger in an aeroplane shalla) never see a rainbowb) may see a primary and a secondary rainbow is concentric arcs.c) may see a primary and a secondary rainbow as concentric arcs.d) shall never see a secondary rainbow.Deselect Answer
13. A laser beam is used for locating distant objects becausea) it is monochromaticb) it is not chromaticc) it is not observedd) it has small angular spreadDeselect Answer
14. If a constant force acts on a particle, its acceleration willa) remain constantb) gradually decreasesc) gradually increasesd) be undefinedDeselect Answer
15. The maximum value of photoelectric current is calleda) base currentb) saturation currentc) collector currentd) emitter currentDeselect Answer
16. A moving charge producesa) electric field onlyb) magnetic field onlyc) both of themd) none of them.Deselect Answer
17. Energy is emitted when electron jumps froma) Lower orbit to higher orbitb) Higher orbit to lower orbitc) Ground state to first excited stated) Second excited state to infinityDeselect Answer
18. In a nuclear reaction which of the following is conserved?a) Energy b) Spinc) Charged) All of theseDeselect Answer
19. Balmer series lies in thea) Ultraviolet regionb) Visible regionc) Near IR regiond) Far IR regionDeselect Answer
20. How many spectral lines are observed for Hydrogen atom when electron jump from to in visible range?a) 10b) 3c) 6d) 15Deselect Answer