2022 Physics

1. Which of these is a derived unit?

• A. Kilogram
• B. Metre
• C. Newton
• D. Second

2. A bar magnet is divided into two pieces, which of the following statement is correct?

• A. two new magnets are created
• B. the magnetic field of each separate piece becomes stronger
• C. the electric field is created
• D. the bar magnet is demagnetized

3. Consider the wave equation y = 5mm sin [1cm⁻¹x – 60s⁻¹t]. The wave number is?

• A. 0.1 cm⁻¹
• B. 10cm⁻¹
• C. 1.0cm⁻¹
• D. 2cm⁻¹

4. An object 40 cm high is 30cm from the pin hole camera. If the height of the image formed is 20 cm. What is the distance of the image from the pin height?

• A. 15 cm
• B. 70 cm
• C. 40 cm
• D. 40 cm

5. A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when?

• A. the magnet is moved towards the stationary solenoid
• B. there is no relative motion
• C. the magnet is moved away from the stationary solenoid
• D. the solenoid is moved away from the stationary magnet

6. Tyres are treaded to?

• A. increase weight of tyres
• B. increase friction
• C. increase its longevity
• D. look good

7. A car starts from rest and covers a distance of 40 m in 10 s. Calculate the magnitude of its acceleration

• A. 3.20 ms⁻²
• B. 0.25 ms⁻²
• C. 0.80 ms⁻²
• D. 4.00 ms⁻²

8. The relationship between the coefficient of linear expansion αα and volumetric expansion (γ) is—————–

• A. γ = α⁻³
• B. γ = α
• C. 3α
• D. γ = α³

9. Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?

• A. formation of hydrogen bubbles on the electrode
• B. increase in the resistance of the cell
• C. local action
• D. polarization

10. A cell whose internal resistance is 0.55ΩΩ delivers a current of 4 A to an external resistor. The lost voltage of the cell is?

• A. 4.00 V
• B. 2.20 V
• C. 0.15 V
• D. 8.00 V

11. Which of the following liquid is a poor conductor of electricity?

• A. Distilled water
• B. Tap water
• C. Sea water
• D. Drinking water

12. An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. The half-life is? 

• A. 3 days
• B. 2 days
• C. 1 day
• D. 4 days

13. The secondary pigments consist of?

• A. blue, green, and violet
• B. yellow, green, and magenta
• C. magenta, yellow, and cyan
• D. red, green, and blue

14. A person standing waist-deep in a swimming pool appears to have short legs because of light?

• A. diffraction
• B. refraction
• C. reflection
• D. interference

15. A tuning fork having a frequency of 312 Hz emits a wave which has a wavelength of 1.10 m. Calculate the velocity of sound

• A. 312.0 ms⁻¹
• B. 110.0 ms⁻¹
• C. 343.2 ms⁻¹
• D. 686.4 ms−1

16. When the plate area of a capacitor increases?

• A. the voltage can withstand increase
• B. the capacitance decreases
• C. the capacitance is unaffected
• D. the capacitance increases

17. A magnet relay is a device used for?

• A. reading the magnitude of magnetic flux
• B. controlling another circuit carrying larger current
• C. turning in sports
• D. storing magnetic field

18. According to kinetic molecular model in gases,

• A. the particles are closely packed together; they occupy minimum space are usually arranged in a regular pattern
• B. the particles vibrate about fixed positions and are held together by the strong intermolecular bonds between them
• C. the molecules are very far apart and occupy all the spaces made available to them
• D. the particles occur in clusters with molecules slightly further apart

19. A current of 0.5 A flows through a resistor when connected to a 40 V battery. How much energy is dispatched in 2 minutes?

• A. 2400 J
• B. 9600 J
• C. 1500 J
• D. 1200 J

20.

For a pear-shaped conductor shown above, the concentration of charge on the outside is highest at?

• A. X
• B. Z
• C. Y
• D. K

21. The vapour pressure?

• A. increases non-linearly with measuring temperature
• B. increases linearly with increasing temperature
• C. decreases linearly with increasing temperature
• D. decreases non-linearly ith measuring temperature

22. The potential energy in an elastic string of force constant k, which has an extension X is?

• A. kX
• B. KX²
• C. ½KX²
• D. ½K

23. A reservoir is filled with liquid of density 2000 kgm⁻¹. Calculate the depth at which the pressure in the liquid will be equal to 9100 Nm⁻²(g = 10 ms⁻²)

• A. 0.262 m
• B. 0.664 m
• C. 0.819 m
• D. 0.455 m

24. Water is not a good thermometric liquid because it?

• A. expands unevenly between 0 ºC and 4 ºC
• B. maintains fixed density
• C. has low freezing point
• D. wets glass

25. Which of these is a second-class lever?

• A. sugar tongs
• B. claw hammer
• C. plier
• D. wheelbarrow

26. In the formation of sea breeze, wind blows from?

• A. sky to land
• B. sea to sky
• C. land to sea
• D. sea to land

27. Which component of fiber-optic connector has a provision of entry for the fibre along with the fixation to connector housing?

• A. coupling device
• B. cable
• C. ferrule
• D. connector housing

28. In order to view the sun, the most suitable instrument to use is?

• A. helioscope
• B. telescope
• C. stroboscope
• D. sun meter

29. The eclipse of the moon occurs when?

• A. the moon reflects the rays from the sun to the earth
• B. the moon comes exactly between the earth and the sun
• C. the earth comes exactly between the moon and the sun
• D. the sun comes exactly between the earth and the moon

30. The gravitational pull on the moon is 1/6 that of the earth. If a body weighs 6.0 N on the moon, what will be the weight on the earth?

• A. 6.0 N
• B. 5.0 N
• C. 12.0 N
• D. 36.0 N

31. The amount of energy required to change a kilogram of ice block into water without a change in temperature is?

• A. specific latent heat of fusion of ice
• B. specific heat capacity of ice
• C. heat capacity of ice
• D. specific heat of vaporization of ice

32. Which expression gives magnetic flux?

• A. qVB sinθ
• B. μϕI/2πr
• C. BA cos θ
• D. -N dϕ/dt

33. The graph of pressure (P) against the reciprocal of the volume (I/V) in Boyles’s law is a?

• A. hyperbola
• B. parabola
• C. curve
• D. straight line

34. What quantity of heat is required to convert 20 g of ice at 0⁰C to water at the same temperature? (Specific latent heat of ice = 336 Jg⁻¹)

• A. 7.06 x 10³J
• B. 5.38 x 10³J
• C. 6.72 x 10³J
• D. 1.35 x 10³J

35. A train of mass 1600 kg attains a speed of 25 ms⁻¹in 20 seconds. The power developed in the engine is?

• A. 2.5 KW
• B. 80 KW
• C. 25 KW
• D. 50 KW

36. The main factor which affects the speed of sound wave is the?

• A. properties of the medium
• B. amplitude of the sound wave
• C. intensity of the sound wave
• D. loudness of the sound wave

37. A semiconductor is formed by?

• A. co-ordinate bonds
• B. electrovalent bonds
• C. a substance free of bonds
• D. covalent bonds

38. One of the following is a scalar quantity?

• A. weight
• B. momentum
• C. potential energy
• D. displacement

39. The mercury column in the barometer at notational atmospheric pressure has a height of?

• A. 0.76 cm at sea level
• B. 760 cm at sea level
• C. 7.6 cm at sea level
• D. 76 cm at sea level

40. If an object just begins to slide on a surface inclined at 30º to the horizontal, the coefficient of friction is?

• A. √3
• B. √3/2
• C. 1/√2
• D. 1/√3