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Physics
1. If the earth stops moving around its polar axis then what will be effect on body placed at south axis?
(a) Remain same
(h) increase
(c) Decrease but not zero
(d) Decrease zero

2. In air the value of the total electric flux emitted from unit positive charge is


(a) to
(b) (coil
(c) (4πε0)-1
(d) 4πε0

3. A rod AB is l m long. The temperature of its one end A is maintained at 100’C and other end Bat 10°C, the temperature at a distance of 60 cm from point B is
(a) 64°C
(b) 36°C
(c) 46°C
(d) 72°C

4. In designing, a beam for its use to support a load. The depression at centre is proportional to (where, Y is Young’s modulus)
(a) Y2
(b) Y
(c) 1/Y
(d) 1/Y2

5. A balloon is filled at 27°C and latm pressure by 500 m’ lie. At -3°C and 0.5 atm pressure, the volume of lie will be
(a) 700 m3
(b) 900 m3
(c) 1000 m3
(d) 500 m3.

6.The particle of mass 50 kg is at rest. The work done to accelerates it by 20 m/s in 10 s is
(a) 103J
(b) 104J
(c) 2 x 103J
(d) 4 x 1034/sup>J

7. The moment of inertia of a circular loop of radius R. at a distance of R / 2 around a rotating axis parallel to horizontal diameter of loop is
(a) MR2
(b) 1/2 MR2
(C) 2MR2
(d) 3/4 MR2

8. The ratio of radius of two bubbles is 2: 1. What is the ratio excess pressure inside them?
(a) 1 : 2
(b) 1 : 4
(c) 2 : 1
(d) 4 : 1

9. In the capacitor of capacitance C, charge Q and energy W is stored. If charge is increased upto 2Q, the energy stored will be
(a) W/4
(b) W/2
(c) 2W
(d) 4W

10. The unit of thermal conductivity is
(a) Wm-1K-1
(b) JK-1
(c) Wmk
(d) JK

11. Photon and electron are given same energy (10-20 J) Wavelength associated with photon statement will he and electron are λp and λe the correct
(a) λp > λe
(b) λp < λe
(c) λp = λe
(d) λe / λp = c

12. The half-life of radioactive element is 600 yr. The fraction of sample that would remain after 3000 yr is
(a) 1/2
(b) 1/16
(c) 1/8
(d) 1/32

13. A particle moves along with x-axis. The position x of particle with respect to time r from origin given by x = b0 + b1t + b2t2. The acceleration of particle is
(a) b0
(b) b1
(c) b2
(d) 2b2

14. Root mean square speed of the molecules of ideal gas is v. If pressure is increased two times at constant temperature, then the rms speed will become
(a) v/2
(b) v
(c) 2v
(d) 4v

15. 1 mole of gas occupies a volume of 200 mL at 100 mm pressure. What is the volume occupied by two motes of gas at 400 mm pressure and at same temperature?
(a) SO ml.
(b) 100 mL
(c) 200 mL
(d) 400 mL

16. A charged particle travels along a straight line with a speed v in a region where both electric field E and magnetic field B are present. it follows that
(a) |E| = v |B| and the two fields are parallel
(b) |E| = v |B| and the two fields are perpendicular
(c) |B| = v |E| and the two fields are parallel
(d) |B| = v |E| and the two fields are perpendicular

17. What will be the wave velocity, if the radar gives 54 waves/min and wavelength of the given wave is 10 m?
(a) 4 m/s
(b) 6 m/s
(c) 9 m/s
(d) S m/s

18. A transformer of 100% efficiency has 200 turns in the primary coil and 40000 rums in secondary coil. It is connected to a 220 V main supply and secondary feeds to a 100 kfl resistance. The potential difference per turn is
(a) 1.1 V
(b) 25 V
(c) 18 V
(d) 11 V

19. A thin convex lens of refractive index 1.5 has 20 cm focal length in air. If the lens is completely immersed in a liquid of refractive index 1.6, us focal length will be
(a) – 160 cm,
(b) – 100 cm
(c) + 10 cm
(d) + 100 cm

20. SI unit of permittivity is
(a) C2m2N2
(b) C2m-2N-1
(c) C2m2N-1
(d) C-1m2N-2

21. A spherical drop of capacitance 1 )41: is broken into eight drops of equal radius. Then, the capacitance of each small drop is
(a) 1/2 μF
(b) 1/4 μF
(c) 1/8 μF
(d) 8 μF

22. A simple harmonic oscillator consists of a panicle of mass in and an ideal spring with spring constant k. The particle oscillates with a time period T. The spring is cut into two equal parts. If one part oscillates with the same particle, the time period will be
(a) 2T
(b) √2T
(c) T / √2
(d) T/2

23. The coefficient of viscosity for hot air is
(a) greater than the coefficient of viscosity for cold air
(b) smaller than the coefficient of viscosity for cold air
(c) same as the coefficient of viscosity for cold air
(d) increase ur decrease depending on the external pressure

24. An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E0. Its potential energy is
(a) -E0
(b) 1.5 E0
(c) 2E0
(d) E0

25. A thin hollow sphere of mass m is completely filled with a liquid of mass rn. When the sphere rolls with a velocity v, kinetic energy of the system is (neglect friction)
(a) 1/2 mv2
(b) mv2
(c) 4/3 mv2
(d) 4/5 mv2

26. A non-conducting body floats in a liquid at 20°C with 2/3 of its volume immersed in the liquid. When liquid temperature is increased
to 100°C, 3 of body’s volume is immersed in the liquid. Then the coefficient of real expansion of the liquid is (neglecting the expansion of container of the liquid)
(a) 15.6 x 10-4°C-1
(b) 156 x 10-4°C-1
(c) 1.56 x 10-4°C-1
(d) 0.156 x 10-4°C-1

27. Two slabs A and B of different materials but of the same thickness are joined end to end to form a composite slab. The thermal conductivities of A and B are K1 and K2 respectively. A steady temperature difference of 12°C is maintained across the composite slab. If K1 = K2 / 2 the temperature difference across slabs A is
(a) 4°C
(b) 6°C
(c) 8°C
(d) 10°C

28. In short wave communication waves of which of following frequencies will be reflected back by the ionospheric layer having electron density 1011 per m3?
(a) 2 MHz
(b) 10 MHz
(c) 12 MHz
(d) 18 MHz

29. A body of mass 4 kg moving with velocity 12 m/s collides with another body of mass 6 kg at rest. If two bodies stick together after collision, then the loss of kinetic energy of system is
(a) zero
(b) 288 J
(c) 172.8 J
(d) 144 J

30. A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 s. Then the coefficient of
friction is
(a) 0.01
(b) 0.02
(c) 0.03
(d) 0.02

31. A body of mass 0.25 kg is projected with muzzle velocity 100 m/s from a tank of mass 100 kg. What is the recoil velocity of the tank?
(a) 5 nvs
(b) 25 in/s
(c) 0.5 m/s
(d) 0.25 m/s

32. A rocket with a lift-off mass 3.5 x 104 kg is blast upward with an initial acceleration of 10 m/s2. Then, the initial thrust of the blast is
(a) 1.75 x 105 N
(b) 3.5 x 105 N
(c) 7.0 x 105 N
(d) 14.0 x 105 N

33. A step down transformer is used on a 1000 V line to deliver 20 A at 120 Vat the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the line is
(a) 3 A
(b) 30 A
(c) 0.3 A
(d) 2.4 A

34. What kV potential is to be applied on X-ray tube so that minimum wavelength of emitted X-rays may be 1 A (h = 6.6 x 10-34J-5)
(a) 12.42 kV
(b) 12.84 kV
(c) 11.98 kV
(d) 10.78 kV

35. Hydrogen atom excites energy level from fundamental state to n = 3. Number of spectrum lines according to Bohr is
(a) 4
(b) 3
(c) 1
(d) 2

36. A black body at a temperature of 2600 K has the wavelength corresponding to maximum emission 1200 A. Assuming the moon to be perfectly black body the temperature of the moon, if the wavelength corresponding to maximum emission is 5000 A is
(a) 7800 K
(b) 6240 K
(c) 5240 K
(d) 3640 K

37. The heat required to increase the temperature of 4 moles of a monoatomic ideal gas from 273 K to 473 K at constant volume is
(a) 200 R
(b) 400 R
(c) 800 R
(d) 1200 R

38. A solid sphere rolls without slipping on the roof. The ratio of its rotational kinetic energy and its total kinetic energy is
(a) 2/S
(b) 4/5
(c) 2/7
(d) 3/7

39. 6Ω and 12Ω resistors are connected in parallel. This combination is connected in series with a 10 V battery and 6Ω resistor. What is the potential difference between the terminals of the 12Ω resistor?
(a) 4 V
(b) 16 V
(c) 2
(d) 8 v

40. Charge passing through a conductor of cross-section area A = 0.3 m2 is given by q sa 3 t2 + St + 2 in coulomb, where t is in second. What is the value of drift velocity at t= 2 s? (Given, n= 2 x 1025 / m3)
(a) 0.77 x 10-5m / s
(b) 1.77 x 10-5m/ s
(c) 2.08 x 105m/s
(d) 0.57 x 105m/s

Directions (Q. Nos. 41.60) These questions consist of two statements each printed as assertion and reason. Whole answering these questions you are required to choose any one of of following responses.
(a) if both Assertion and Reason are true and Reason is the correct explanation of Assertion
(h) If the Assertion and Reason are true but Reason is not correct explanation of Assert ion
(c) If Assertion is true but, Reason is false
(d) If Assertion is false but, Reason Is true

41. Assertion When a body is dropped or thrown horizontally from the same height, it would reach the ground at the same time.
Reason Horizontal velocity has no effect on the vertical direction.

42. Assertion Two similar trains are moving along the equatorial line with the same speed but in opposite direction. They will exert equal pressure on the rails.
Reason In uniform circular motion the magnitude of acceleration remains constant but the direction continuously changes.

43. Assertion A table cloth can he pulled from a table without disloading the dishes.
Reason To every action there is an equal and opposite reaction.

44. Assertion Soft steel can be made red hot by continued hammering on it, but hard steel cannot.
Reason Energy transfer in case of soft is large as in hard steel.

45. Assertion The centre of mass of an electron and proton, when released moves faster towards proton.
Reason Proton is heavier than electron.

46. Assertion A planet moves faster, when it is closer to the sun in its orbit and vice versa.
Reason Orbital velocity in orbit of planet is constant.

47. Assertion A large force is required to drawn apart normally two glass plates enclosing a thin water film.
Reason Water works as glue and sticks two glass plates.

48. Assertion The water rises higher in a capillary tube of small diameter than in the capillary tube of large diameter.
Reason Height through which liquid rise in capillary tube inversely proportional to the capillary tube.

49. Assertion If the bob of a simple pendulum is kept in a horizontal electric field, its period of oscillation will remain same.
Reason If bob is charged and kept in horizontal electric field, then the time period will be decreased.

50. Assertion A thermoelectric refrigerator is based on the Peltier effect.
Reason A thermocouple may be used as a radiation detector.

51. Assertion The pattern and position of fringes always remain same even after the introduction of transparent medium in a path of one of the slit.
Reason The central fringe is bright or dark depends upon the initial phase difference between the two coherence sources.

52. Assertion Balmer senes lies in the visible region of electromagnetic spectrum.
Reason 1/λ = R (1 / 22 – 1 / n2)
where, n = 3.4, 5…

53. Assertion Corpuscular theory fails in explaining the velocities of light in air and water.
Reason According to corpuscular theory, light should travel faster in denser media than in rarer media.

54. Assertion Susceptibility is defined as the ratio of intensity of magnetisation I to magnetic intensity H.
Reason Greater the value of susceptibility smaller the value of intensity of magnetisation I.

55. Assertion It is nor possible to have interference between the waves produced by two violins.
Reason For interference of two waves the phase difference between the waves must remain constant.

56. Assertion A metallic shield in the form of a hollow shell may be build to block an electric field.
Reason In a hollow spherical shield. the electric field inside it is zero at every point.

57. Assertion The molecules of a monoatomic gas has three degrees of freedom.
Reason The molecules of a diatomic gas has five degrees of freedom.

58. Assertion To observe diffraction of light the size of obstacle/aperture should be of the order of 10-7 m.
Reason 10-7m is the order of wavelength of visible light.

59. Assertion The resolving power of a telescope is more if the diameter of the objective lens is more.
Reason Objective lens of large diameter collects more light.

60. Assertion A beam of charged particles is employed in the treatment of cancer.

Reason Charged panicles on passing through a material medium loss their energy by causing ionisation of the atoms along their path