(Paper) DCE (Delhi College of Engineering) Entrance Examination Sample Paper (Physics)

PAPER : DCE (Delhi College of Engineering) DCE Entrance Examination Sample Paper (Physics)

The question paper contains 180 questions. Four choices are given for a question out of which one choice may be correct. Each question carries 4 marks. The total marks of the Entrance Test are 720 (240 for each subject, i.e., Physics, Chemistry, Maths). You will get 4 marks for each correct response. For each incorrect response, one mark will be deducted from the total score. As such for each incorrect response, you will lose 5 marks (4 for wrong response and one mark as penalty).

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1. Following two wave trains are approaching each other.
y1 = a sin 200 p t      y2 = a sin 208 p t
The number of beats heard per second is :

A. 8

B. 4

C. 1

D. 0


2. One of the geo-stationary satellites of India is vertically above

A. New Delhi

B. Mumbai

C. Allahabad

D. None of these


3. Light of wavelength 2400 x 10-10 m in air will become light of wavelength in glass (m = 1.5) equal to

A. 1600 x 10-10 m

B. 7200 x 10-10 m

C. 1080 x 10-10 m

D. none of these


4. The ratio of secondary to primary turns is 4:5. If power input is P, what will be the ratio of power output (neglect all losses) to power input ?

A. 4:9

B. 9:4

C. 5:4

D. 1:1


5. Lenz's law applies to

A. electrostatics

B. lenses

C. electro-magnetic induction

D. cinema slides


6. If a proton and anti-proton come close to each other and annihilate, how much energy will be released ?

A. 1.5 x 10-10 J

B. 3 x 10-10 J

C. 4.5 x 10-10 J

D. none of these

 

7. If Sn is doped with As, what will be the result ?

A. n-type semi-conductor

B. p-type semi-conductor

C. intrinsic semi-conductor

D. none of these


8. A charge is placed at the centre of a cube, what is the electric flux passing through one of its faces?

A. (1/6) x (q/e0)

B. q/e0

C. 6q/e0

D. None of these


9. What is the degree of freedom in case of a mono atomic gas ?

A. 1

B. 3

C. 5

D. None of these


11. Speed of recession of galaxy is proportional to its distance

A. directly

B. inversely

C. exponentially

D. none of these


12. If a substance goes in a magnetic field and is pushed out of it, what is it ?

A. Paramagnetic

B. Ferromagnetic

C. Diamagnetic

D. Antiferromagnetic

13. Which is not a scalar quantity?

A. Work

B. Power

C. Torque

D. Gravitational Constant


14. Minimum energy required to excite an electron in a Hydrogen atom in ground state is :

A. -13.6 eV

B. 13.6 eV

C. 10.2 eV

D. 3.4 eV


15. If Gravitational Constant is decreasing in time, what will remain unchanged in case of a satellite orbiting around earth ?

A. Time period

B. Orbiting radius

C. Tangential velocity

D. Angular velocity


16. If a transparent medium of refractive index m = 1.5 and thickness t = 2.5 x 10-5 m is inserted in front of one of the slits of Young's Double Slit experiment, how much will be the shift in the interference pattern ? The distance between the slits is 5.0 x 10-3 cm and that between slits and screen is 100 cm.

A. 5 cm

B. 2.5 cm

C. 0.25 cm

D. 0.1 cm


17. How does light propagate in optical fibres?

A. Total internal reflection

B. Refraction

C. Reflection

D. None of these


18. Dispersion of light is due to

A. wavelength

B. intensity of light

C. density of medium

D. none of these

 

19. Which of the following conclusions is correct regarding a stationary body?

A. No force is acting on the body

B. Vector sum of forces acing on the body is zero

C. The body is in vacuum

D. The forces acting on the body do not constitute a couple


20. Energy released in stars is due to

A. Fission

B. Fusion

C. Combustion

D. Chemical reaction


21. 13 days is the half-life period of a sample. After how many days, the sample will become 1/16th of the original substance ?

A. 52

B. 3.8

C. 3

D. none of these


22. Absolute zero is the temperature at which

A. water solidifies

B. all gases become liquid

C. motion of molecules becomes minimum

D. everything solidifies


23. Motion of liquid in a tube is described by

A. Bernaulli's Theorem

B. Poiseuille Equation

C. Stoke's Law

D. Archimedes' Principle

24. Molecular motion shows itself as

A. Temperature

B. Internal Energy

C. Friction

D. Viscosity


25. Which is this gate ?

A. AND

B. NAND

C. OR

D. NOR


26. Energy bands in solids are a consequence of

A. Ohm's Law

B. Pauli's Exclusion Principle

C. Bohr's Theory

D. Heissenberg's Uncertainty Principle


27. A boy of mass M stands on the floor of an elevator moving downwards with an acceleration a which is less than g. The force exerted by the boy on the floor of the elevator is

A. Mg x Ma

B. g + a

C. Mg – Ma

D. Mg + Ma


28. A body A of mass m1 exerts a force on another body B of mass m2. If the acceleration of B be a2, then the acceleration (in magnitude ) of A is

A. m2/m1 (a2)

B. m1m2 a2

C. m1/m2 (a2)

D. (m1 + m2) a2

29. What does not change when sound enters from one medium to another ?

A. Wavelength

B. Speed

C. Frequency

D. none of these


30. Resolving power of a microscope depends upon

A. wavelength of light used, directly

B. wavelength of light used, inversely

C. frequency of light used

D. focal length of objective


31. An astronaut of weight Mg is in a rocket accelerating upward with an acceleration of 4g. The apparent weight of the astronaut will be

A. 5Kg

B. 4Kg

C. Mg

D. zero


32. One proton beam enters a magnetic field of 10-4 m/s normally, sp. charge = 1011 C/kg, velocity = 109 m/s. What is the radius of the circle describe by it ?

A. 0.1 m

B. 100 m

C. 10 m

D. none of these


33. If a black body radiates 20 calories per second at 227°C, it will radiate at 727°C

A. 10 calories per second

B. 80 calories per second

C. 320 calories per second

D. none of these


34. If a carnot engine is working with source temperature equal to 227°C and its sink temperature is at 27°C, its efficiency will be

A. 20%

B. 10%

C. 67%

D. 50%

 

35. If the frequency of an oscillating particle is n, then the frequency of oscillation of its potential energy is

A. n

B. 2n

C. n/2

D. 4n


36. If an electron oscillates at a frequency of 1 GHz, it gives :

A. X-rays

B. Micro-waves

C. Infra-red rays

D. None of these


37. Earth's atmosphere is richest in

A. Ultra-violet rays

B. Infra-red rays

C. X-rays

D. Micro-waves


38. Cathode rays consist of

A. Photons

B. Electrons

C. Protons

D. a -particles


39. A body of mass m1 is moving with a velocity V. It collides with another stationary body of mass m2. They get embedded. At the point of collision, the velocity of the system

A. increases

B. decreases but does not become zero

C. remains same

D. becomes zero


40. One projectile moving with velocity V in space, gets burst into 2 parts of masses in the ratio 1:2. The smaller part becomes stationary. What is the velocity of the other part ?

A. 4V

B. V

C. 4V/3

D. 2V/3

41. A thief steals a box of weight W & jumps from the third floor of a building. During jump, he experiences a weight of

A. W

B. 3W

C. 1.5W

D. zero


42. Two electron beams are moving parallel in space but in opposite directions; then

A. they will attract each other

B. they will repel each other

C. no interaction will take place

D. none of these


43. Two wires with resistances R and 3R are connected in parallel, the ratio of heat generated in 2R and R is

A. 1 : 3

B. 2 : 1

C. 1 : 4

D. 4 : 1


44. A wire is drawn such that its radius changes from r to 2r, the new resistance is

A. 2 times

B. 4 times

C. 8 times

D. 1/16 times


45. In solids, inter-atomic forces are

A. totally repulsive

B. totally attractive

C. combination of (a) and (b)

D. none of these

 

46. When horse starts running all of a sudden, the rider on the horse back falls backward because

A. he is taken aback

B. he is afraid

C. due to inertia of rest, the upper part of his body remains at rest

D. due to inertia of motion, the lower part of his body comes in motion


47. What should be the minimum velocity at the highest point of a body tied to a string, so that the string just does not slack ?

A. Ö (Rg)

B. Ö (5Rg)

C. (R/g)3/2

D. Ö (2Rg)


48. If a person standing on a rotating disc stretches out his hands, the speed will:

A. increase

B. decrease

C. remain same

D. none of these


49. EMF is most closely related to

A. mechanical force

B. potential difference

C. electric field

D. magnetic field


50. Planetary system in the solar system describes

A. conservation of energy

B. conservation of linear momentum

C. conservation of angular momentum

D. none of these

 

51. Lenz's law is based upon

A. energy

B. momentum

C. angular momentum

D. inertia


52. Faraday's second law states that mass deposited on the electrode is directly proportional to

A. atomic mass

B. atomic mass x velocity

C. atomic mass/valency

D. valency


53. Unit of power is

A. kilowatt hour

B. kilowatt per hour

C. kilowatt

D. erg


54. Power can be expressed as

A. F.v

B. 1/2 (Fv2)

C. F.t

D. F x v


55. Units of coefficient of viscosity are

A. Nms-1

B. Nm2 s-1

C. Nm-2 s

D. Nms-2


56. Dimensions of torque are

A. MLT-2

B. ML2T-2

C. M2L2T-2

D. ML-2T-2

 

57. A body of weight mg is hanging on a string, which extends its length by l. The work done in extending the string is

A. mg l

B. mg l/2

C. 2 mg l

D. none of these


58. The water droplets in free fall are spherical due to

A. gravity

B. viscosity

C. surface tension

D. inter-molecular attraction


59. A ball of mass 1Kg is accelerating at a rate of 1ms-2. The rate of change of momentum is

A. 1 Kg ms-2

B. 2 Kg ms-2

C. 3 Kg ms-2

D. 4 Kg ms-2


60. A body orbitting around earth at a mean radius which is two times as great as the parking orbit of a satellite. The period of the body is

A. 4 days

B. 2Ö 2 days

C. 16 days

D. 64 days

 

61. Gamma rays are

A. high energy electrons

B. low energy electrons

C. high energy electro-magnetic waves

D. high energy positrons

 

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