Physics - Mock Test 23

Question 221

An object is placed at the focus of a concave mirror. The image will be_____

A) real, inverted, same size at the focus B) real, upright, same size at the focus C) virtual, inverted, highly enlarged at infinity D) real, inverted, highly enlarged at infinity

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Question 222

The image formed by a convex mirror of a real object is larger than the object_____________

A) when u < 2f B) when u > 2f C) for all values of u D) for no value of u

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Question 223

A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a _____________

A) converging lens B) diverging lens C) plano-converging lens D) plano-diverging lens

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Question 224

What is type of a dental mirror

A) Convex mirror B) Concave mirror C) Plane mirror D) Both b and c

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Question 225

What is the reciprocal, of the length of radius of curvature

A) Focal length B) Curvature C) Optical center D) Power

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Question 226

What is the lens

A) An image – forming device B) An image – producing device C) An image – reflecting device D) An object – reflecting device

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Question 227

The spherical surface of lens results in ________

A) having a wide range of focal length B) having a narrow range of focal length C) having a wide range of curvature D) having a narrow range of curvature

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Question 228

Water is flowing through a tube of non-uniform cross-section. Ratio of the radius at entry and exit end of the pipe is 3 : 2. Then the ratio of velocities at entry and exit of liquid is

A) 4 : 9 B) 9 : 4 C) 8 : 27 D) 1 : 1

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Question 229

Rain is falling vertically downwards with a speed of 4 km/hr. A man moves on a straight road with 3 km/hr spee4⃣ Apparent velocity of rain with respect of man will be

A) 7 km/hr B) 5 km/hr C) 1 km/hr D) Apparent velocity of rain with respect of man will be? 1⃣ 7 km/hr 2⃣ 5 km/hr 3⃣ 1 km/hr

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Question 230

If you set up the seventh harmonic on a string fixed at both ends, how many nodes and antinodes are set up in it

A) 8, 7 B) 7, 7 C) 8, 9 D) 9, 8

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