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Physics - Light, Colorful World,Magnetic Effects,Electricity

Total questions: 119

Worksheet time: 1hrs 12mins

Name
Class
Date
1.

Curved Mirrors are actually a part of

a)

A Circle

b)

A Cone

c)

A Sphere

d)

A Hemisphere

2.

In the case of a Concave Mirror, if object is kept Beyond C, where will be the image formed?

a)

At F

b)

Between F and C

c)

At C

d)

Between P and F

3.

A Ray Parallel to the Principal Axis will pass through the ________ in the case of Concave Mirror.

a)

Focus

b)

Centre

c)

Optical Centre

d)

None of these

4.

Formula for Magnification in Mirrors is :

a)

A) -v/u

b)

B) Height of object/Height of Image

c)

C) v/u

d)

Both A and B

5.

The Mirror Formula is :

a)

1/v + 1/u = 1/f

b)

None Of These

c)

1/v - 1/u = 1/f

d)

1/u - 1/v = 1/f

6.

Refractive Index Of Water and Kerosene RESPECTIVELY:

a)

1.46 , 1.52

b)

1.50 , 1.77

c)

1.33 , 1.44

d)

1.44 , 1.35

7.

In the case of a Convex Lens, if object is kept Beyond 2F1, where will be the image formed?

a)

At 2F2

b)

At Infinity

c)

At F2

d)

Between F2 and 2F2

8.

Power of a lens is :

a)

A) Equal to the focal length

b)

B) Inversely Proportional to the focal length

c)

C) Proportional to the focal length

d)

Both B and C

9.

Power of a Concave Lens of focal length 2m ?

a)

-0.5 dioptre

b)

0.5 dioptre

c)

2 dioptre

d)

-2 dioptre

10.

Speed of Light in Vacuum is :

a)

3 * 10⁸ m/s

b)

3 * 10⁷ m/s

c)

2 * 10-⁸ m/s

d)

2 * 10⁷ m/s

11.

The laws of reflection hold true for : [CBSE 2020]

a)

Plane Mirror

b)

Concave Mirror

c)

Convex Mirror

d)

All of these

12.

When an object is kept within the focus of a Concave Mirror, an enlarged image is formed behind the Mirror, the image is: [CBSE 2020]

a)

Real

b)

Inverted

c)

Virtual and inverted

d)

Virtual and erect

13.

A real image 2/3rd of the size of an object is formed by a convex lens when

the object is at a distance of 12 cm from it. Find the focal length of the

lens. [CBSE 2019]

a)

7.2 cm

b)

3.6 cm

c)

-7.2 cm

d)

-3.6 cm

14.

A 5 cm tall object is placed perpendicular to the principal axis of a

convex lens of focal length 20 cm. The distance of the object from

the lens is 30 cm. Find the position, nature and size of the image

formed. [CBSE 2019]

a)

At Infinity, Real and Enlarged

b)

At F, Virtual and Diminished

c)

At C, Real and Diminished

d)

None of these

15.

SI unit of Power of Lens is :

a)

Meters

b)

Centimeters

c)

Dioptre

d)

None of these

16.

Mirror formula give relation between

a)

A) Focal length and Pole

b)

B) Centre of curvature and Focal length

c)

C) Object Distance, Image Distance, Focal length

d)

Both B and C

17.

Light Travels:

a)

In a Straight Line

b)

in a Curved Line

c)

None of these

18.

If Light travels from a rarer medium to a denser medium, it will:

a)

A) Have increased velocity

b)

B) Have decreased velocity

c)

C) Have decreased Wavelength

d)

Both B and C

19.

Image formed by a concave mirror is real, inverted and of same size, the position of object should be:

a)

At F

b)

At C

c)

Beyond C

d)

Between C and F

20.

Focal length of a concave mirror is:

a)

Negative

b)

Positive

c)

Depends on Position of Image

d)

Depends on Postion of Object

21.

Focal length of a Plane Mirror is:

a)

Negative

b)

Zero

c)

Infinity

d)

None of These

22.

Angle of Incidence and Angle of Refraction are equal in a glass slab when value of i is:

a)

0

b)

90

c)

Depends on the material of the Slab

d)

45

23.

A ray of Light is seen to be reflected by a plane mirror at an angle of 30º with the mirror. What will be the angle of incidence?

a)

0

b)

60

c)

120

d)

30

24.

An object is placed at Centre of Curvature of Concave Mirror, what will be the distance between the object and its image?

a)

Equal to f

b)

Equal to 2f

c)

Zero

d)

Equal to C

25.

If the Magnification is Negative, then the mirror will be

a)

Either concave or convex

b)

Plane Mirror

c)

Concave

d)

Convex

26.

Absolute Refractive Index of Glass and Water are 1.5 and 1.33 respectively, In which medium does light travel faster? Calculate Ratio of speeds of light in the two media?

a)

Glass, 0.87

b)

Water, 0.87

c)

Water, 1.13

d)

Glass, 1.13

27.

Object of Height 12cm is placed perpendicular to the principal axis of concave lens of focal length 7.5 cm, Find distance of the object from the lens if the distance of the image from lens is 5cm.

a)

u = -3cm

b)

u = -3m

c)

u = -15cm

d)

u = 15m

28.

Calculate the magnification of the image of an object placed perpendicular to the principal axis of convex lens of focal length 10 cm, if object is at distance of 15cm from the lens

a)

2

b)

-0.5

c)

-2

d)

0.5

29.

Dioptre is denoted by:

a)

D

b)

2F

c)

F

d)

C

30.

The light's Spectrum is called as:

a)

VIBGYOR

b)

ROYGBIV

c)

VIBYGOR

d)

ROYBIGV

31.

In the case of a prism, Angle between the incident ray and the emergent ray is called

a)

Angle of Refraction

b)

Angle of Deviation

c)

Angle of Reflection

d)

None of these

32.

Which color deviates the least when light passes through a prism

a)

Red

b)

Blue

c)

Green

d)

Violet

33.

The angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected is called

a)

Angle of deviation

b)

Angle of incidence

c)

Critical Angle

d)

None of these

34.

Which Color has the shortest wavelength?

a)

Blue

b)

Violet

c)

Green

d)

None of these

35.

If light scatters the least at Noon, then what color will be the Sky?

a)

Blue

b)

Purple

c)

Violet

d)

Red

36.

Sun is Visible to US

a)

A) 2 Minutes after the Actual Sunset

b)

B) 2 minutes after the Actual Sunrise

c)

C) 2 minutes before the Actual Sunset

d)

Both A and B

37.

Prism always Refracts Light Towards

a)

Its TOP

b)

Its BASE

c)

Upward Direction

d)

None of the Above

38.

Who discovered that light gets scattered into its component Colors.

a)

Isaac Newton

b)

Michael Faraday

c)

James Clerk Maxwell

d)

Galileo Galilei

39.

When sunlight enters Atmosphere, it gets refracted because of :

a)

Atmospheric Reflection

b)

Atmospheric Dispersion

c)

Atmospheric Refraction

d)

None of these

40.

Rainbow Occurs because of which phenomenon

a)

A) Refraction by water droplets

b)

B) Dispersion by water droplets

c)

C) Total Internal Reflection by water droplets

d)

Both B and C

41.

What is Angle of Prism?

a)

Angle between Incident ray and refracted ray

b)

Angle between incident ray and emergent ray

c)

Angle between incident ray and reflected ray

d)

None of the Above

42.

Who used Glass Prism to obtain spectrum of light?

a)

Galileo Galilei

b)

Isaac Newton

c)

Michael Faraday

d)

James Clerk Maxwell

43.

Why does Red color bends the least?

a)

Because it has Slow speed

b)

Because it has Small Wavelength

c)

Because it has more refractive index

d)

None of These

44.

Which is the correct case of refraction through a prism

a)

A

b)

B

c)

C

d)

D

45.

When white light enters a prism, it gets split into its constituent colours. This is due to

a)

different refractive index for different wavelength of each colour

b)

each colours has same velocity in the prism.

c)

prism material have high density.

d)

Scattering of light

46.

The air layer of atmosphere whose temperature is less then the hot layer behave as optically

a)

denser medium

b)

rarer medium

c)

inactive medium

d)

either denser or rarer medium

47.

The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

a)

scattering

b)

interference

c)

tyndell effect

d)

Reflection

48.

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

a)

moves fastest in air

b)

is absorbed the most by smoke or fog

c)

is scattered the least by smoke or fog

d)

is scattered the most by smoke or fog

49.

A ray of white light enters the raindrop and undergoes __________ and __________ to form a spectrum.

a)

refraction; dispersion

b)

reflection; dispersion

c)

dispersion; diffraction

d)

scattering; dispersion

50.

The refraction of light passed by the Earth’s Atmosphere having air layers of varying __________ is called atmospheric refraction.

a)

optical densities

b)

densities

c)

volumes of air

d)

winds

51.

Statement: Blue light scatters more than red light during

a)

day time

b)

night time

c)

twilight

d)

none of the above

52.

The power of lens being +4 D, suggests that it is :

A. Convex lens

B. Plane convex lens

C. Concave lens

D. none

a)

A

b)

B

c)

C

d)

D

53.

When an object moves towards a convex lens the size of image :

A. Decreases

B. Increases

C. First decreases then increases

D. Remains the same

a)

A

b)

B

c)

C

d)

D

54.

The angle between two refracting surfaces of prism is :

a)

Angle of Emergence

b)

Angle of Prism

c)

Angle of Deviation

d)

Angle of Incidence

55.

In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by

(A) y, p, z

(B) x, q, z

(C) p, y, z

(D) p, z, y [CBSE 2017]

a)

A

b)

B

c)

C

d)

D

56.

A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence (∠ i). He then measures the corresponding values of the angle of refraction ( ∠r) and the angle of emergence ( ∠e) for every value of the angle of incidence. On analysing these measurements of angles, his conclusion would be

(A) ∠ i > ∠r > ∠ e

(B) ∠i = ∠e > ∠r

(C) ∠i < ∠ r < ∠e

(D) ∠i = ∠e < ∠r [CBSE 2017]

a)

A

b)

B

c)

C

d)

D

57.

If the image formed by a lens for all positions of an object placed in front of it is always erect and diminished, what is the nature of this lens ? [CBSE 2017]

a)

Concave Lens

b)

Convex Lens

58.

If the numerical value of the power of lens is 10 D, what is its focal length in the Cartesian system ?

a)

-10 cm

b)

0.1 m

c)

-10 m

d)

None of these

59.

An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.

a)

Virtual, Erect and Enlarged, formed at other side of lens

b)

Virtual, Erect and Diminished, formed at other side of lens

c)

Real, Inverted and Diminished, formed at other side of lens

d)

None of these

60.

S.I Unit of Current

a)

Ampere

b)

C/s

c)

Charge per second

d)

All of these

61.

To Honour Whom, SI unit of current was given name after him.

a)

Isaac Newton

b)

Sir Hans Christian Oersted

c)

Andre Ampere

d)

Alessandro Volta

62.

SI Unit of Electric Potential

a)

Volts

b)

Joules

c)

Ampere

d)

Voltage

63.

Work Done is equal to:

a)

A) Current

b)

B) Charge

c)

C) Energy

d)

Both B and C

64.

Current in a circuit is Inversely Proportional to its:

a)

Potential Difference

b)

Heat

c)

Resistance

d)

All of These

65.

SI unit of Resistance

a)

A) Ohms

b)

B) Volt/Ampere

c)

C) Ampere/volt

d)

Both A and B

e)

All of these

66.

SI Unit of resistivity is Ohm Metre

a)

True

b)

False

67.

Resistance is Directly Proportional to the __________ of the conductor

a)

Area

b)

Diameter

c)

Cross Section

d)

Length

68.

What will happen to the resistivity of Wire if it is Halved

a)

It decreases

b)

It increases

c)

Remains the same

d)

None of these

69.

WHAT IS THE MELTING POINT OF TUNGSTEN IN DEGREE CELSIUS?

a)

ABOUT 3460

b)

ABOUT 5437

c)

ABOUT 3380

d)

ABOUT 2225

70.

WHICH OF THESE IS A GOOD CONDUCTOR OF ELECTRICITY?

a)

A) AMMETER

b)

B) VOLTMETER

c)

BOTH A AND B

d)

NONE OF THESE

71.

Electrical potential is ------------

a)

scalar quantity

b)

vector quantity

c)

both scalar and vector

d)

neither scalar nor vector

72.

kilowatt hour is unit of

a)

energy

b)

power

c)

momentum

d)

force

73.

How is a voltmeter connected in the circuit to measure the potential difference between two points?

a)

series

b)

parallel

c)

according to the situation either series or parallel

d)

none

74.

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, power consumed will be ---------------. [Use P = (V X V)/R]

a)

100 W

b)

75 W

c)

50 W

d)

25 W

75.

The property of a conductor by which it obstructs the flow of current is known as ------------------ of the conductor

a)

voltage

b)

conductivity

c)

power

d)

resistance

76.

What is the direction of conventional current?

a)

positive terminal to negative terminal

b)

negative terminal to positive terminal

c)

depends on the condition

d)

none

77.

Ammeter is used to measure ----------------.

a)

voltage

b)

electric current

c)

resistance

d)

resistivity

78.

Ohm's law is applicable only when ----------------

a)

temperature remains constant

b)

temperature increases

c)

temperature decreases

d)

none

79.

Keeping the potential difference constant, the resistance of the circuit is halved, the current will become --------------

a)

four times

b)

half

c)

double

d)

one-third

80.

What is the maximum resistance which can be made using five resistor each of 1/5 ohm?

a)

1/5 ohm

b)

10 ohm

c)

5 ohm

d)

1 ohm

81.

What is the minimum resistance which can be made using five resistors each of 1/5 ohm?

a)

1/5 ohm

b)

1/25 ohm

c)

1/10 ohm

d)

1/15 ohm

82.

When a 4 ohm resistor is connected across the terminals of a 2 V battery, the number of coulombs passing through the resistor per second is --------------

a)

0.5

b)

1

c)

2

d)

4

83.

What is Formula for Power (P)

a)

A) IT

b)

B) Q/t

c)


V×QtV\times\frac{Q}{t}

d)

E*t

e)

Both A and B

84.

Heat is directly Proportional to :

a)

A) Resistance

b)

B) Current

c)

C)Power

d)

Both A and B

85.

A current of 10 A flows through a conductor for two minutes.
i) Calculate the amount of charge passed through any area of cross section of the conductor.
ii)If the charge of an electron is 1.6*10^-19 

then calculate the total number of electrons flowing   [CBSE 2013]

a)

i) 1200C , ii)  7.5×10217.5\times10^{21}  

b)

i) 800C , ii)  6.5×10206.5\times10^{20}  

c)

i) 400C, ii) 8.5×10218.5\times10^{21}  

d)

None of these

86.

The Resistance of a wire of 0.001 cm radius is 10 Ohm, if it's resistivity is 50×10−8Ωm50\times10^{-8}\Omega m  , Find the Length of the wire[CBSE 2014]


a)

62.8 cm

b)

628 cm

c)

6.28 cm

d)

None of these

87.

i)Which two resistors are connected in series?

ii) Which two resistors are connected in parallel?

iii) If every resistor is 2 Ohm, what will be the Current flowing in the circuit? [Delhi 2009]

a)

i)R1,R2 ii) R3,R4 iii) 2A

b)

i)R3,R5 ii) R2,R4 iii) 6A

c)

i)R5,R4 ii) R2,R3 iii) 1A

d)

None Of These

88.

Two lamps, one rated 100W; 220V

and the other 60W; 220V, are connected in parallel to electric mains supply. Find the current drawn by the two lamps from the line, if the supply voltage is 220V

. [CBSE 2014]

a)

0.75 A

b)

0.72 A

c)

0.74 A

d)

0.73 A

89.

Name the instrument used to measure the electric potential difference. (CBSE 2011, 2012)

a)

Voltmeter

b)

Ammeter

c)

Galvanometer

d)

None of these

90.

Inside Magnet, the magnetic field lines go from :

a)

North to South

b)

East to West

c)

South to North

d)

None of these

91.

The magnetic field inside a long straight solenoid carry

ing current is

a)

Zero

b)

decreases as we move towards its end

c)

increases as we move towards its end

d)

the same at all points

92.

Fleming left hand rule gives the direction of:

a)

Magnetic field

b)

Current

c)

Induced Current

d)

Motion (Force)

93.

Fleming right hand rule gives the direction of :

a)

Force

b)

Current

c)

Induced current

d)

Magnetic field

94.

Fuse wire has high melting point. True or False:

a)

True

b)

False

c)

May be false

d)

May be correct

95.

A rectangular coil copper wires is rotated in a magnetic field. The direction of the induced current changes once in each:

a)

Two revolution

b)

One revolution

c)

Half revolution

d)

One-forth revolution

96.

The magnetic field lines near a long straight wire carrying current are:

a)

Straight lines

b)

Concentric rings

c)

Spiral lines

d)

Radial lines

97.

The device used for producing current is called a:

a)

Galvanometer

b)

Ammeter

c)

Motor

d)

Generator

98.

Which of the following is not the source of magnetic field:

a)

Moving charge

b)

Electric current

c)

Magnet

d)

A small piece of iron

99.

Magnetic field is maximum:

a)

At Two Poles

b)

At one pole

c)

At The center of the magnet

d)

Outside the magnet

100.

What is the pattern of magnetic field lines at the center of a current carrying solenoid:

a)

Concentric rings

b)

Straight lines

c)

Curved lines

d)

Radial lines

101.

Hans Christian Oersted Discovered :

a)

Current

b)

Electricity

c)

Heat

d)

Electromagnetism

102.

Force on a current carrying conductor in an external magnetic field depends on

a)

magnetic field strength

b)

current through the conductor

c)

length of the coil

d)

material of the conductor

103.

Only a change in magnetic field lines linked with a coil can induce current in the coil

a)

True

b)

False

104.

When North pole approaches a coil, the front side of the coil will show __________ current.

a)

Anticlockwise

b)

Clockwise

c)

Can't predict

105.

In an electric motor, the direction of current in the coil changes once in each:

a)

One-fourth rotation

b)

Half rotation

c)

One rotation

d)

Doesn't change

106.

Identify the poles of the magnet in the given figure.

a)

NORTH

b)

SOUTH

c)

One is north and the other is south

d)

Can't predict

107.

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid will

a)

Increase

b)

Decrease

c)

Remains same

d)

Becomes zero

108.

The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is:

a)

45o

b)

60o

c)

90o

d)

180o

109.

A positive charge is moving towards you. The direction of magnetic field lines as seen by you will be in

a)

Clockwise direction

b)

Anticlockwise direction

c)

Vertically upward direction

d)

Vertically downward direction

110.

Which of the following diagrams correctly shows the magnetic field produced by a current- carrying wire?

a)

A

b)

B

c)

C

d)

D

111.

When a magnet is moved with its north polarity towards a coil placed in a closed circuit, then the nearest face of the coil shows north polarity.

a)

True

b)

False

112.

An Electric charge in a uniform motion produces

a)

An Electric Field only

b)

An Magnetic field only

c)

Both Electric Field & Magnetic field

d)

Neither of them

113.

Two parallel wires carrying current in the same direction attract each other because of

a)

Potential difference between them

b)

Mutual inductance between them

c)

Electric forces between them

d)

Magnetic forces between them

114.

Choose the incorrect statement from the following regarding magnetic lines of field

a)

The direction of magnetic field at a point is taken to be the direction in which the north pole of the compass needle points

b)

Magnetic field lines are closed curves

c)

If magnetic field lines are parallel and equidistant, they represent zero field strength

d)

Relative strength of magnetic field is shown by degree of closeness of their field lines

115.

What does crowding of magnetic field lines indicate ? (CBSE 2010, 2011)

a)

Magnetic Field in that region is Weak

b)

Magnetic Field in that region is Strong

c)

Magnetic Field in that region is Either Weak or Strong

d)

None of these

116.

It is a long, helically wound coil of insulated copper wire.

a)

Magnet

b)

Solenoid

c)

Magnetic Field

d)

None of these

117.

Write an expression for the force acting on a conductor of length l carrying current (I) and placed perpendicular to the magnetic field (B)

a)

I = FLB

b)

L = BIF

c)

F = BIL

d)

None of these

118.

What is electric motor ? (CBSE 2012)

a)

A device which converts electrical energy into mechanical energy.

b)

A device which converts Mechanical energy into Electrical energy.

c)

A device which converts Magnetic energy into Electrical energy.

d)

A device which converts Electrical energy into Magnetic energy

119.

Name any one method to induce current in a coil. (CBSE 2015)

a)

Magnetic Induction

b)

Electromagnetic Induction

c)

Electric Induction

d)

None of these

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