Q1. the critical angle for total internal reflection at an air- water interface is approximately 48⁰ in which of the following situations will total internal reflection occur?
answer
light incident in air at 55⁰
Q2. Refraction is a measure of the ………….. as a wave passes from medium to another?
answer
velocity
Q3. which of these may not be a useful apparatus in an optical experiment?
answer
crocodile clip
Q4. which of the following is not true of experiments involving curved mirrors?
answer
focal length is negative for convex mirrors
Q5. in an experiment, potential difference is plotted on the vertical axis and current on the horizontal axis. the slop of the graph represents?
answer
resistance
Q6. describe the image of a candle positioned 20cm in front of a concave mirror of focal length 30cm
answer
virtual, erect, 60cm behind mirror and magnified 3 time
Q7. for metallic conductor, ohms law holds provided
answer
temperature remain constant
Q8. the potentiometer wire plays role of which of these device in a circuit?
answer
rheostat
Q9. which of the following is not true about a rheostat?
answer
it is a constant current instrument
Q10. calculate the distance and magnification of an object place 20cm from a converging lens?
answer
60cm and 3 times the size of object
Q11. which of the following is correct about tracing ray diagrams with curve mirrors?
answer
coming soon check back later
Q12. …. five object labeled 1, 2, 3, 4, and 5 are shown at various locations about the double sided mirror. the image of object 1 would be located in section ________?
answer
M
Q13. convex mirrors are mostly used as?
answer
driving mirrors
Q14. which of the following is not applicable when plotting the graph of experimental data?
answer
the scale must be chosen to make the graph occupy as small as possible of the graph page?
Q15. when refraction occurs which of the following remains unchanged?
answers
frequency
Q16. An estimate of the refractive index of glass is 1.5. if the angle of incidence is 30⁰ the angle of refraction is?
answer
19₀
Q17. convex mirrors are mostly used as?
answer
driving mirrors
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