Which of the following is not a mechanical wave?
A. wave propagated in stretched string? B. wave in closed pipe C. radio waves D. water waves E. sound waves Correct Answer: Option C – radio waves
What part of the camera corresponds to the iris of the eye?
A. shutter B. film C. lens D. diaphragm E. focusing ring Correct Answer: Option D – diaphragm
At which of the following distances from the lens should a slide be placed on a slide projector if f is the focal length of the projector length?
A. less than f B. greater than f but less than 3f C. equal to f D. equal to 2f E. greater than 2f Correct Answer: Option C – equal to f
Which of the following are true of plane-polarized right?
i. Plane polarization of light is the formation of hydrogen bubbles on the particle of light. ii. Plane components. iii. A plane-polarized light vibrates in one plane. iv. Polarisation of light is characteristic of transverse vibration A. i and ii only B. i and iv...
An image which can be formed on a screen is said to be?
A. virtual B. blurred C. inverted D. erect E. real Correct Answer: Option E – realProducts
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