Question Bank Physic-1
Question Bank Physic-1
Question Bank Physic-1
Chapter : Magnetism
1. Which theory states that, "every molecule of magnetic substance is a tiny magnet"?
5. The places in a magnet where the resultant attractive or repulsive forces appear to be concentrated is called
(a) neutral points (b) center of bar-magnet (c) magnetic poles (d) none of these
1
A) 4 10 -7 Henry/meter B) 10 -7 Henry/meter
4
1
C) Henry/meter D) 10 -7 Henry/meter
4 10 -7
7. The unit of pole strength in S.I. units is
2
(a) weber (b) ampere-meter (c) ampere/meter (d) ampere-meter
1
A) 4 0 B) 4 10 -7 0 C) 10 -7 0 D) 0
4
9. The ratio
0 gives
10. The relation between magnetic flux density B and intensity of magnetic field H is given by
A) B 0 H B) H 0 B C) B 4 0 H D) H 4 0 B
(a) greater than 1 (b) less than 1 (c) equal to 1 (d) equal to zero
0 M M 0 2M 2M
A) B) C) D)
4 d3 4 d3 4 d3 4 d3
14. Magnetic field induction on equatorial line B = ..................
2M 0 2M M 0 M
A) B) C) D)
4 d3 4 d3 4 d3 4 d3
15. The value of B on axial line is ............................ the value of B on equatorial line for the same distance
7
(a) equal to (b) twice (c) half (d) 10 times
17. The point where the magnetic field induction due to bar-magnet B and horizontal component of the earth's
(a) neutral point (b) magnetic pole (c) center of the bar-magnet (d) none of these
A) A - m B) A - m 2 C) A/m D) A/m 2
20. The property of magnetic material of retaining certain amount of intensity of magnetism even after removal of applied
magnetic field is called
Intensity of magnetisation
22. Intensity of applied field
(a) dia, para and ferro magnetic substances and is dependent of relative permeability
A) ampere/meter B) henry/meter
2
C) newton/meter D) weber/meter 2
34. Magnetic material moves from stronger to weaker parts in a magnetic field in
(a) is a strong pole (b) exists (c) does not exists (d) is a weak magnet
40. Light is
47. When a ray of light passes from a denser to a rarer medium, which angle is more?
48. When light is refracted, which of the following does not change?
(a) is less than the angle of incidence (b) is equal to the angle of incidence
(c) is greater than the angle of incidence (d) cannot be predicated
50. The formation of antinodal and nodal lines results in relatively bright and dark regions called
(a) water waves (b) sound waves (c) light waves (d) all waves
52. The binding of a waveform or its deviation from the original direction of propagation when it meets a small
obstacle is called
55. The scientific principle behind a laser was first put forward by
(a) He-Ne laser (b) Pulsed laser (c) Ruby laser (d) none of these
(a) 6943 A (b) 6328 A (c) 5893 A (d) 6928 A
2
A) Cr2 O 3 , Al 3 B) Al 2 O 3 , M 2
C) SiO 2 , Cr 3 D) Al 2 O 3 , Cr 3
64. Population inversion takes place when
A) N 2 N1 B) N 2 N1 C) N 2 N1 D) none of these
65. Coherence makes a laser light
(a) orderly way (b) temporal coherence (c) optical music (d) none of these
(a) 1000 A
(b) 10 A
(c) 10 8 A
(d) 100 A
Chapter : Sound
P P P
A) v B) v C) v D) v
P
68. In a resonating air column experiment with a closed-end tube, if first resonance occurs when the length of the air column
is 10 cm. Second resonance occurs at
(a) elasticity (b) inertia (c) density (d) elasticity and inertia
A) C / 2 B) C C) 3 C / 2 D) 2 C
P
A. v / B) v C) 2 ( l 2 - l1 ) D) Cv / Cp
(a) Zero (b) 330 m/s (c) 340 m/s (d) none of these
-1
79. Wavelength of sound whose velocity 350 m s and frequency 1000 Hz is
A) / 2 B) C) / 4 D) 2
A) / 2 B) / 4 C) D) 2
A) C p / C v B) P V C) v D) E m c 2
85. When a sound wave enters from one medium to another the physical quantity that remains unchanged is
86. The reason for the continuous decrease of the amplitude of vibrating bodies
(a) current electricity (b) static electricity (c) direct current (d) alternating current
88. The net charge flowing through a cross-section of conductor in unit time is called
93. When 90 coulombs of charge flows in 5 minutes, the strength of current in amperes is
96. If three cells of EMF 1V, 2V and 3V are connected in series, the effective EMF=
97. If three cells of EMF 3V, 4V and 6V are connected in parallel, the effective EMF=
101. An electrolyte is
102. Resistance is
104. The relationship between P.D. (V), current (i) and resistance (R) is
8 8
(a) 3 X 10 m/s (b) 3 X 10 cm/s (c) 330 cm/s (d) 330 m/s
10 8
(a) 30 s (b) 28 s (c) 3 X 10 s (d) 3 X 10 s
l l lR
A) R l B) R C) D)
A A
109. Which of the following statement is true?
8 8
(a) 1.7 X 10 ohm-cm (b) 1.8 X 10 ohm-cm
7 7
(c) 2.8 X 10 ohm-cm (d) 4.4 X 10 ohm-cm
(a) the material (b) its length (c) its cross-section (d) all of these
114. At a given temperature, the specific resistance of a conductor depends only on the
115. When three resistance, 4 , 6 and 8 are connected in series, the effective resistance is
116. When resistance of 8 and 12 are connected in parallel, the effective resistance is
1 1 1 1
A) R B) R1 R 2 R 3
R1 R 2 R 3 R
1 1 1 1
C) R R 1 R 2 R 3 D)
R R1 R 2 R 3
118. Which of the following expressions is wrong?
1 1 1
A) Effective resistance
R series R1 R 2
1
B) Effective resistance R1 R 2
R series
1 R 1R 2
C) Effective resistance
R Parallel R1 R 2
1 1 1
D) Effective resistance
R Parallel R1 R 2
121. Power =
2
(a) i Rt (b) Vit (c) iR (d) Vi
122. 1 WH =
5 6
(a) 3600 watt-sec (b) 36 X 10 watt-sec (c) 10 watts (d) 1000 X 60 watts
2 2
(a) W = i Rt (b) W = i Rt/J (c) P = Vi (d) W = Vit
124. The heat produced when 10 amp. of current passes through a conductor of resistance 230 in 2 minutes is
(a) 2300 cal (b) 276000 cal (c) 4600 cal (d) 2760000 cal
125. Which of the following remains uneffected during electrolysis of copper sulphate?
126. The process of decomposition of solution into its constitued ions, when electric current passes through it is
called
(a) chemical equivalent (b) e.c.e (c) m/q (d) none of these
130. Mass of gold deposited in 10 minutes, when a current of 2 amp. passes through gold, voltameter is (given Z of Au =
0.0006812 g/coul)
132. When a current of 1.25 amp. gives 1.485 g of metal in 1 hour, the value of Z in g/coul is
133. The ratio of atomic weight of an element to its valency is defined as its
134. "The induced current will appear in such a difference that it opposes the change that produced it" is known as
(a) Farday's law (b) Ampere's law (c) Lenz's law (d) none of these
135. The force acting on a conductor carrying current (i) placed in external magnetic field is
(a) central finger (b) thumb (c) pointing finger (d) none of these
38. The device which converts electrical energy into mechanical energy is
in in iAn
A) BiAn B) B C) D)
A AB B
141. The speed of an electric motor is
143. The device which converts electrical energy into light energy is called
(a) dynamo (b) motor (c) battery cell (d) none of these
(a) heat energy (b) light energy (c) mechanical energy (d) chemical energy
(a) A.C. dynamo (b) D.C. dynamo (c) dry cell (d) secondary cells
(a) induced current (b) direct current (c) alternating current (d) none of these
151. The device which converts mechanical energy into electrical energy is
(a) motor (b) battery cell (c) volta cell (d) dynamo
(a) self induction (b) mutual induction (c) D.C. source (d) none of these
Vs n np ip Vp is
A) s B) C) D) none of these
Vp np ns is Vs ip
158. 1 Henry is
(a) steel core (b) iron core (c) tungsten core (d) none of these
161. Two of each R ohms resistances are connected in parallel. Then the effective resistance is
162. The resistance of conductor is R . If the length and also the cross-section are both doubled. Then the resistance of
the conductor
163. The wattage of an electric bulb is W and the resistance of the filament is R. If it is connected to a voltage V, the current in
it is 'i'. Then the correct relation among these is
i2 R
A) V WR B) i W V C) V D) i
W W
164. A coil connected to 230V supply delivers a power of 115 watts. Then the resistance of the coil is
5
A) 6 B) 3 C) 1 D) 1
6
170. Symbol of a transformer is
171. Which of the magic-triangle is wrong?
i 0 i i
A) 0 B) C) 2 0 D) none of these
r 2 r r
Chapter : Kinematics
(a) 9.8 m s
1
(b) (c) 9.8 m s
2
(d) 0
175. Maximum height reached by a body thrown up vertically with an initial velocity u is
u2 2g u
A) u 2 2g B) C) D)
2g u2 g
1 1 1
(a) 10 m s (b) 15 m s (c) 0 (d) -10 m s
177. The time taken by a body to remain in the air which is moving under the influence of gravity is
178. The time taken by a body thrown up to reach maximum height (h) is called its
(a) time of descent (b) time of flight (c) time of ascent (d) none of these
179. The time taken by a freely falling body to touch the ground is called its
(a) time of descent (b) time of ascent (c) time of flight (d) none of these
180. The time for which a body remains in the air is called
(a) time of flight (b) time of descent (c) time of ascent (d) travelling time
181. The upward velocity and downward velocity of a body at a particular point is
(a) unequal (b) equal (c) approximately equal (d) none of these
182. In order to keep a body in air above the Earth for 12 s, with what velocity the body is to be thrown vertically up?
1 1 1 1
(a) 12 m s (b) 144 m s (c) 58.8 m s (d) 588 ms
183. According to Kepler's Law, the planets move around the sun in this orbit
186. The gravitational force with which the Earth attracts the Moon
(a) is less than the force with which the Moon attracts the Earth
(b) is greater than the force with which the Moon attracts the Earth
(c) is equal to the force with which the Moon attracts the Earth
(d) none of the above
5 5
(a) 3.85 X 10 km (b) 3.85 X 10 m
5 5
(c) 38.5 X 10 km (d) 385 X 10 m
189. The Moon makes one revolution around the Earth in how many days.
2 2 2 2 2 2 2
(a) Nm kg (b) Nm kg (c) Nm kg (d) Nm kg
195. The gravitational force between the two bodies does not depend upon
196. If the Earth is 1/4 of its present distance from the Sun, the duration of the year would be
(a) 1/4 of the present year (b) 1/6 of the present year
(c) 1/8 of the present year (d) 1/16 of the present year
198. The unit of quantity G/g where G is the gravitational constant and g the accelerartion
due to gravity
kg m2 kg
A) B) C) D) kg - m
m2 kg m
2 2 2 2
(a) 9.8 m s (b) 1.67 m s (c) 98 m s (d) 167 m s
2 2 2
(a) 9.8 m s (b) zero (c) 98 m s (d) 0.98 m s
201. While measuring the diameter of a lead shot using a screw gauge, the reading on the pitch scale is found to be
7.5 mm and that on the head scale is 48. If the L.C. is 0.01mm, the diameter of the lead shot is
202. In a screw gauge, each centimeter of the pitch scale is divided into 20 division. If there are 50 divisions on the head
scale, least count of the instrument is
204. The distance travelled by the tip of a screw gauge for complete rotation of its head is called the
205. The smallest length that can be measured accurately using any scale is called
(a) pitch of the screw (b) least count (c) millimeter (d) none
1. A 2. A 3. A 4. A
5. A 6. A 7. A 8. A
9. A 10. A 11. A 12. A
13. A 14. A 15. A 16. A
17. A 18. A 19. A 20. A
21. A 22. A 23. A 24. A
25. A 26. A 27. A 28. A
29. A 30. A 31. A 32. A
33. A 34. A 35. C 36. A
37. A 38. A 39. A
Chapter : Light - Nature of 40. A 41. A
Light And Sources of Light
42. A 43. A 44. A 45. A
46. A 47. A 48. A 49. A
50. A 51. A 52. A 53. A
54. A 55. A 56. A 57. A