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511.

Which of the following is not due to total internal reflection?
(a)Mirage on hot summer days
(b)Brilliance of diamond
(c)Difference between apparent and real depth of a pond
(d)Working of Optical Fibre
Comment
Answer is: B

512.

To an observer on the earth the stars appear to Twinkle. This can be described to
(a)Frequent absorption of star light by Earth's atmosphere
(b)The fact that starts do not emit light continuously to their own atmosphere
(c)The refractive index fluctuations in Earth's atmosphere
(d)Frequent absorption of starlight by their own atmosphere
Comment
Answer is: C

513.

In case of hypermetropia
(a)A concave lens should be used for correction
(b)A cylindrical lens should be used for correction
(c)The image of a near object is formed behind the retina
(d)The image of a distinct object is formed in front of the retina
Comment
Answer is: C

514.

Which of the following is not correctly matched?
(a)Voltameter ---- Potential difference
(b)Ammeter ---- Electric current
(c)Potentiometer -- Emf
(d)Metre Bridge --- Electrical resistance
Comment
Answer is: A

515.

Consider the following statements
A copper voltameter measures the
1. Quantity of current passing through the circuit.
2. Amount of copper deposited.
3. Resistance of the circuit
Which of these statements are correct?
(a)1 and 2
(b)2 and 3
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: A

516.

Four wires of same material and of dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?
(a)Wire of 1 m length and 2 mm diameter
(b)Wire of 2 m length and 2 mm diameter
(c)Wire of 5 m length and 105 mm diameter
(d)Wire of 1 m length and 1 mm diameter
Comment
Answer is: A

517.

A straight horizontal conductor carries a steady electric current from South to North.
Which one of the following events would happen if a small magnetic compass placed just above the wire?
(a)The needle remains perpendicular to the conductor
(b)The needle remains parallel to the conductor
(c)The north pole of the needle is deflected towards east
(d)The north pole of the needle is deflected towards west
Comment
Answer is: A

518.

Consider the following statements regarding a motor car battery
1. The voltage is usually 12V.
2. Electrolyte used in Hydrochloric acid.
3. Electrode are lead and copper.
4. Capacity is expressed in ampere hour.
Which of the above statements are correct?
(a)1 and 2
(b)2 and 3
(c)3 and 4
(d)1 and 4
Comment
Answer is: D

519.

Consider the following statements
An ordinary light bulb has a rather short life because the
1. Filament wire is not uniform.
2. Bulb cannot be evacuated completely.
3. Wires supporting the filament melt at high temperatures.
Which of the above statements are correct
(a)1 and 2
(b)2 and 3
(c)1 and 2
(d)1, 2 and 3
Comment
Answer is: B

520.

A fuse is used in mains Electric Supply as a safety devices. Which one of the following statements about the fuse is correct?
(a)It is connected in parallel with the main switch
(b)It is made mainly from silver alloys
(c)It must have a low melting point
(d)It must a very high resistance
Comment
Answer is: C

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