DCE (Delhi College of Engineering) Entrance Examination Sample Paper - Physics
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).
1. Following two wave trains are approaching each other. | |||
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
PHYSICS
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