When a plane mirror at which a ray is incident is rotated through an angle \( \theta \), the reflected ray will be rotated through
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1991
The image in a pin-hole camera is
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1991
Which of the following is TRUE of light and sound waves?
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1991
A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min. 12s and 1min. 7s respectively.The mean period of oscillation of the pendulum is
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1991
A room is heated by means of a charcoal fire, An occupant of the room standing away from the fire is warmed mainly by
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1991
A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?
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1991
Two tuning forks of frequency 256Hz and 260Hz are sounded close to each other. What is the frequency of the beats produced?
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1991
Which of the following correctly, describes the image of an object, 4cm from a diverging lens of focal length 12cm?
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1991
In a ray diagram for a thin converging lens, a ray that is not parallel to the optic axis but passes through the optic center will
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1991
A trough 12.0cm deep is filled with water of refractive index \(\frac{4}{3}\). By how much would a coin at the bottom of the trough appear to be displaced when viewed vertically from above the water surface?
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1991
A moving coil galvanometer of 300\(\Omega\) resistance gives full scale deflection for 1.0mA. The resistance R, of the shunt that is required to convert the galvanometer into a 3.0A ammeter is
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1991
The function of the system of granulated carbon mixed with manganese (IV) oxide in a Letanche cell is to
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1991
An insulated rod when rubbed with a material acquires
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1991
Which of the following statements is CORRECT about the earth's magnetic field?
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1991
When the bottom tip of a vibrating tuning fork is held in contact with a wooden box, a louder sound is heard. This phenomenon is known as
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1991
The electrochemical equivalent of platinum is 5.0 x 10-7kgC-1 to plate-out 1.0kg of platinum, a current of 100A must be passed through an appropriate vessel for
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1991
If a current carrying coil is mounted on a metal frame, the back e.m.f. induced in the coil causes
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1991
To convert an alternating current dynamo into a direct current dynamo, the
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1991
An equipment whose power is 1500W and resistance is 375 ohms would draw a current of