IOE and class 11/12 MCQ physics question

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Here I have colected MCQ question Which is very Important for Class 11/12 an IOE student⬇️⤵️

 1. A wire is stretched to double its length.The stress produced is

A. equals to Y

B. Less than Y

C. greater than Y

D. none 

2. Rms velocity of gas molecule is directly proportional to

A. Temperature

B. Square root of temperature

C. Pressure

D. Square root of the pressure.

3. A car of mass 'movinga with speed 'v' is stopped at a distance 

'x' by the friction between the tyres and the road. If K.E. of the 

car is doubled, stopping distance will be

A. 8x

B. 4x

C. 2x

D. x 

4. Ignition occurs in petrol engine from

A. compression of air at high temperature

B. compression of fuel at high temperature 

C. by spark

D. none 

5. Rain drops of equal size fall in air with terminal velocity of 2

cm/s. A drop formed by coalescing 27 drops obtain a terminal

velocity of

A. 54 cm/s

B. 108 cm/s

C. 18 cm/s

D. 6 cm/s 

6. The instrument used for measuring electric current is

A. ammeter

B. voltmeter

C. potentiometer

D. wattmeter 

7. The collision in which the relative velocity after collision is

zero is

A. perfectly elastic collision

B. perfectly inelastic collision

C. semi elastic collision

D. may be elastic or inelastic 

8. The diesel engines are also known as ..................... Engine

A. compression ignition

B. spark ignition

C. dual ignition

D. otto ignition 

9. A fuse wire of radius 0.2 mm blows when current flowing is

5A. Value of current for another fuse wire of same material of

radius 0.3 mm to blow is

A. 5 A

B. 9.2 A

C. 12.4 A

D. 20 A 

10. When a woolen sweater worm over a nylon shirt is removed,

sparking is observed due to

A. Static electricity

B. Current electricity

C. None

D. Both 

11. Two bulbs A and B are placed respectively at 20cms and

30cms on opposite sides of an oily paper screen.The two sides of

the screen are equally intense.The ratio of power of the bulb A

to that of B will be

A. 4:9

B. 9:4

C. 2:3

D. 3:2 

12. The frequency of a fork A is 3% more than the frequency of

a standard fork whereas the frequency of fork B is 3% less. If

fork A and B produce 6 beats per second the frequncy of

standard fork will be

A. 100 Hz

B. 106 Hz

C. 103 Hz

D. 112 Hz 

13. A square frame of side L is dipped in a liquid soap.When it

is taken out of the liquid a soap film is formed on it . If the

surface tension of soap is T, then the force acting on frame is,

A. 2TL

B. 4TL

C. 8TL

D. 10TL 

14. A spring is in simple harmonic motion.If the mass of the

pendulum is increased by 4 times the time period of the

pendulum will

A. increases by 4 times

B. decreases by 4 times

C. increases by 2 times

D. increases by 1/2 times 

15. The image, of a virtual object, produced by a convex mirror

is 

A. inverted

B. diminished

C. virtual

D. real 

16. Sound energy is converted into electrical energy in

A. Loudspeaker

B. microphone

C. sonometer

D. radio 

17. With the rise in temperature, surface tension

A. Increases

B. Decreases

C. Remains the same

D. Becomes zero 

18. A horse pulls a wagon. The force that horse gets from is :

A. It exerts on the wagon

B. The wagon exerts on him

C. It exerts on the ground

D. The ground exerts on him 

19. Fraunhoffer's spectrum of sun is :

A. Band absorption spectrum in chromosphere

B. Line absorption spectrum in chromosphere

C. Emission spectrum 

D. Band emission spectrum 

20. Two gaseous molecule of mass M1 and M2 has mean square

speed as:

A. √M1/M2

B. √M2/M1

C. M2/M1

D. M1/M2 

21. N - atom of sample disintegrate in K α - particle/sec. Then

half life of sample is

A. N/K

B. 0.693 N/K

C. 0.693 K/N

D. K/N 

22. A sodium surface is illuminated with light having a wave

length of 300nm. The work function for sodium metal is 2.46eV.

The maximum kinetic energy of the ejected photoelectrons is

A. 4.13eV

B. 2.4ev

C. 1.67ev

D. 6.59eV 

23. If kinetic energy of a particle is increased by four times the

De-Brogile wavelength becomes

A. 2 times 

B. 1/2 times

C. 1/√2 times

D. √2 times 

24. If the Earth suddenly looses quality to attract things

A. The mass will vanish

B. The weight will vanish

C. Both weight and mass will vanish

D. None of the above 

25. An alpha particle makes a complete revolution in circular

path of radius 0.8m in 2 seconds.The magnetic field induction in

Tesla at the centre of the circle will be

A. 0.5∗10^(−19)μo

B. 0.3∗10^(−19)μo

C. 1.0∗10^(−19)μo

D. 0.2∗10^(−19)μo 

26. When a rod of length 2m carrying current 10 A is placed

perpendicular to magnetic flux density of strength of 0.15 T.

What is the force experienced by it ?

A. 2 N

B. 0.3 N

C. 1 N

D. 3 N 

27. A wire resistance 16 ohm is bent into circular form. Then

equivalent resistance between two points of any diameter is

A. 8Ω

B. 32Ω

C. 16Ω

D. 4Ω 

28. Two metal strips that constitude a thermostat must

necessarily differ in their

A. mass

B. length

C. resistivity

D. coefficient of linear expansion 

29. On penetrating a uniform charged sphere, the electrical field

strength E

A. remains unchanged

B. decreases

C. increases

D. is zero at all points 

30. The colors of thin films result due to

A. interference of light

B. dispersion of light

C. scattering of light

D. selective absorption of light   

31. 8 small drop of capacitance and radius 'r' combines to form a

big drop of radius 'R' then the capacitance of big drop will be

A. 2 C

B. 4 C

C. 8 C

D. 16 C 

32. Two sound waves of equal intensity I produce beats. The

maximum intensity of sound produced in beats will be

A. I

B. 2 I

C. 2√2 I

D. 4 I 

33. Which is scalar quantity?

A. temperature gradient

B. intensity of magnetization

C. intensity of radiation

D. current density 

34. In Young's double slit experiment, 12 fringes are obtained in

a certain fragment of the screen when light of wavelength 600

nm is used. If the wave length of light is changed t0 400 nm,

number of fringes obtained in the same segment of the screen

will be 

A. 12

B. 18

C. 24

D. 30 

35. A man heard the thunder 6 seconds later he saw a lightening.

The temperature of air is 27oC. How far was the flash of light

from the man? ( Velocity of sound in air at 0oC is 332 m/s )

A. 1822 m

B. 2332 m

C. 2088 m

D. 2445 m 

36. A wooden block of volume 1000cc is suspended from a

spring balance. It's weight is 12N in air. It is suspended in water

such that half of the block is below the surface of water.

Reading of spring balance will be

A. 10N

B. 9N

C. 8N

D. 7N 

37. An X-ray tube is operated at 20kV.The maximum speed of

electrons striking the anticathode wil be

A. 4.2∗(10^7) m/s

B. 8.4∗(10^7) m/s

C. 8.4∗(10^3) m/s 

D. 4.8∗(10^7) m/s 

38. Displacement of particle with respect to time t is x =

(ao)+2(a1)t+(a2)(t^2).The acceleration is

A. ao

B. a1

C. a2

D. 2(a2) 

39. Radius of electron moving in a magnetic field in a

perpendicular direction is proportional to:

A. Momentum

B. Magnetic field

C. Charge of electron

D. Potential 

40. A body is projected with a velocity equal to twice the escape

velocity(ve) from the earth. The velocity of the body in free

space will be

A. ve

B. 1.5ve

C. √2ve

D. √3ve 

41. A diffraction pattern is obtained using a beam of red light,

What happen if the red light is replaced by blue light?

A. no change 

B. diffraction bands become broader and recorded

C. bands become broader and further apart

D. bands may disappear 

42. The objective of terrestrial telescope has a focal length of 50

cm and its magnifying power is 10 when adjusted for parallel

rays. If the erecting lens has a focal length 15 cm, the total

length of such a telescope is

A. 65 cm

B. 75 cm

C. 95 cm

D. 115 cm 

43. A ray of light is incident at angle of incidence ‘i’ on one

surface of a prism of small refracting angle ‘A’ and emerges

normally from the opposite surface. If the R.I. of the material of

the prism is μ; the angle of incidence ‘i’ is equal to

A. A/μ

B. A/(2μ)

C. μA

D. μ(A/2) 

44. An air parallel plate capacitor has capacity C. When capacity

and distance between the plate is double and immersed in liquid

then dielectric constant of liquid is

A. 1

B. 2

C. 3 

D. 4 

45. A refrigerator has to transfer an average of 263J of heat per

second from -10oC to 25oC. The average power consumed by

the refrigerator is :-

A. 10W B. 20W C. 35W D. 40W

46. The instrument used to measure energy is:

A. currentmeter

B. voltmeter

C. watt-hour meter

D. ammeter 

47. The pressure at the end of compression in petrol engine

compared to that of diesel engine would be

A. higher

B. lower

C. same

D. none. 

48. In an adiabatic process

A. Pressure is constant

B. the gas is expanded isothermally

C. there is perfect heat insulation

D. system exchanges heat with 

 surrounding 

49. When a beam of light travelling in air enters a glass block, it

ordinarily undergoes change in :

A. speed only

B. frequency only

C. wave length

D. speed and wave length both

50. A parallel beam of light of 6000 Ao is incident normally on

a slit of width 0.2 mm. A diffraction pattern is observed on a

screen which is placed at a focal plane of convex lens of focal

length 50 cm. Lens is close to slit then distance between minima

on both side of central maxima will be

A. 1 mm

B. 2 mm

C. 3 mm

D. 4 mm

51. Heating of a current carrying conductor is due to

A. loss of kinetic energy by atoms

B. loss of kinetic energy by electrons

C. attraction between electrons

D. repulsion between protons and electrons

52. Parallel circuit is

A. voltage divider circuit

B. current divider circuit

C. charge divider circuit

D. all of theses 

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