Physics - Comprehensive Mock Test 4

Question 31 Hard

A ball of mass 0.1 kg coming with speed 30 m/s strikes with a bat and returns in opposite direction with speed 40 m/s, then the impulse exerted on the ball is : <br>(Taking final velocity as positive)

A) 7 N–s B) 1 N–s C) 3 N–s D) 4 N–s

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Question 32 Medium

What is the unit of the physical quantity Inductance?

A) weber B) farad C) henry D) tesla

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Question 33 Hard

Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cm from the optical centre?

A) -3.75 diopters B) -11.25 diopters C) 3.75 diopters D) 11.25 diopters

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Question 34 Hard

An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is?

A) greater than one meter B) less than one meter C) one meter D) a foolish question

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Question 35 Hard

In an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then?

A) V = VR+VL+VC B) V2 = VR2+VL2+VC2 C) V2 = VL2+(VR-VC) 2 D) None of these

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Question 36 Hard

A capacitor of 30μF charged to 100V is connected in parallel to capacitor of 20μF charged to 50V. The common potential is?

A) 75V B) 150V C) 50V D) 80V

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Question 37 Medium

An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be?

A) 12 B) 24 C) 5 D) 1100

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Question 38 Easy

A convex lens acts as a diverging lens if the?

A) object is beyond C B) if the object is with in C C) if the object is within f D) both b and c

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Question 39 Medium

Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is?

A) 0.5 B) 0.2 C) 1 D) 2

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Question 40 Hard

A cup of milk is placed in a microwave oven. Tell which statements is false (1) Milk will be heated up only (2) Cup will remain cool (3) Both cup and mild will get hot?

A) both B) 1 C) 2 D) 3

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