Physics Objective Type Questions with Answers for the preparation of Engineering Entrance Test : AIEEE, IIT-JEE, CET

(Important For 10+1 & 10+2 Science Students)

Test 2
 

(1) A material ‘B’ has twice the specific resistance of ‘A’. A circular wire made of ‘B’ has twice the diameter of a wire made of ‘A’. Then for the two wires to have the same resistance, the ratio A / B of their respective lengths must be

(a) 2
(b) 1/2
(c) 4
(d) 1/3

Answer (a) 2

(2) In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. The path of the particle will be a

(a) circle
(b) helix
(c) straight line
(d) ellipse

Answer (c) straight line

(3) Needles N1, N2 and N3 are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will

(a) attract all three of them
(b) attract N1 and N2 strongly but repel N3
(c) attract N1 strongly, N2 weakly and repel N3 weakly
(d) attract N1 strongly, but repel N2 and N3 weakly

Answer (c) attract N1 strongly, N2 weakly and repel N3 weakly

(4) A player caught a cricket ball of mass 150 g moving at a rate of 20 m/s. If the catching process is completed in 0.1 s, the force of the blow exerted by the ball on the hand of the player is equal to

(a) 300 N
(b) 150 N
(c) 3 N
(d) 30 N

Answer (d) 30 N

(5) A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m which applying the force and the ball goes upto 2 m height further, find the magnitude of the force. Consider g = 10 m/s2

(a) 22 N
(b) 4 N
(c) 16 N
(d) 20 N

Answer (d) 20 N

(6) The maximum velocity of a particle, executing simple harmonic motion with an amplitude 7 mm, is 4.4 m/s. The period of oscillation is

(a) 100 s
(b) 0.01 s
(c) 10 s
(d) 0.1 s

Answer (b) 0.01 s

(7) A string is stretched between fixed points separated by 75 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is

(a) 10.5 Hz
(b) 105 Hz
(c) 1.05 Hz
(d) 1050 Hz

Answer (b) 105 Hz

(8) The current I drawn from the 5 volt source will be

(a) 0.17 A
(b) 0.33 A
(c) 0.5 A
(d) 0.67 A

Answer (c) 0.5 A

(9) The resistance of a bulb filament is 100 Ω at a temperature of 100°C. If its temperature coefficient of resistance be 0.005 per °C, its resistance will become 200 Ω at a temperature of

(a) 200°C
(b) 300°C
(c) 400°C
(d) 500°C

Answer (b) 300°C

(10) A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current will

(a) flow from Antimony to Bismuth at the cold junction
(b) flow from Antimony to Bismuth at the hot junction
(c) flow from Bismuth to Antimony at the cold junction
(d) not flow through the thermocouple

Answer (a) flow from Antimony to Bismuth at the cold junction 

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