12th physics english medium Refresher Course One Mark questions இயற்பியல் ஆங்கில வழி வினாக்கள்

12th physics english medium Refresher Course  One Mark questions

1. convert 25°C to Kelvin scale

299.15K

298°K

298.15°K

298.15 K

2. calculate the resistance of a wire in which a current of 10A passes through it with the potential difference of 50V

2ohms

5.4 ohms

5 ohms

2.5 ohms

3. 1Kwh=?

3.6×10^-5J

3.6×10^6J

3.6×10^-6J

3.6×10^5J

4. SI unit of specific heat capacity

J kg^2 K^2

J kg^1K^-1

J^-1kg^-2K^-1

J kg^-1K^-1

5. speed of light in air is 3×10^8m/s, speed of light in medium is 2×10^8m/s. Find the refractive index of the medium with respect to air

2.3

2.5

1.3

1.5

6. electrons are revolving in in non radiating orbits in an atom this was discovered by

JJ Thomson

Rutherford

Bohr

Roentgen

7. At resonance, amplitude of vibration is

minimum

maximum

infinity

zero

8. Mode of energy transfer from one body to another by electro magnetic waves

convection

Reflections

conduction

Radiation

9. calculate number of neutrons in oxygen atom (8O^16)

6

16

8

4

10. which process is defined as measure of disorder?

reversible process

irreversible process

entropy

enthalpy

11. Cathode rays consists of

electron

proton

Neutron

position

12. Two resistors of resistance 2 Ohm are connected in series Find their effective resistance?

4 ohm

1ohm

1.5 ohm

3.4ohm

13. Who discovered X Ray?

Bohr

Rutherford

Roentgen

JJ Thomson

14. rear mirror in vehicle is a mirror

parabolic mirror

convex mirror

concave mirror

plane mirror

15. Average kinetic energy of 1 mole of a gas

3/2nRT

2/3RT

3/2RT

2/3nRT

16. Particles inside a nucleus are

electrons and neutrons

protons and neutrons

protons and electrons

protons

17. charge of 50 C is passing through a wire in 25s find the value of current

1 A

2 A

3 A

1.5 A

18. Example for forced oscillaton

swing of cradle

oscillaton of simple pendulum

vibration of tuning fork

sound boards of stringed instruments

19. collision of gas molecules in a container creates

pressure

energy

volume

temperature

20. The phenomenon that occurwhen light travels from water to air in an angle of incidence greater than critical angle of water is

interference

diffraction

total internal reflection

Refraction

21. When the source of sound and observer are in relative motion that is an apparent change in frequency of sound. this is called

Raman effects

interference

Doppler effect

tyndall effect

22. Snell's law of refraction is

sin r /sin i =constant

sin r /sin i= 1

sin i/ sin r =1

sin i /sin r =constant

23. Equation for Joules law

H=V I/ t

H=V^2Rt

H=VR^2t

H=V I t

24. A mobile phone tower transmits a wave of signal of frequency 900 MHz. calculate the length of waves transmitted from the mobile tower?

0.33m

300 m

2700m

1200m

25. Equation for displacement in SHM is

y= Asin^2wt

y= A sinwt

y=2Asinwt

y=Awsinwt

26. Formation of rainbow is due to

Mirage

interference

total internal reflection

dispersion

27. principle of stethoscope

reflection of sound waves

interference of sound waves

diffraction of sound waves

refraction of sound waves

28. principle of transformer is

electromagnetic induction

resonance

action of points

electrostatic induction

29. Example for non periodic motion is

vibration of tuning fork

oscillaton of simple pendulum

swing of cradle

eruption of volcano

30. unit of wave length

metre

degree

radian

metre^-1