SSC Model test Physics, Chemistry,Mathematics and Telecommunication For SI And ASI telecom

SSC Model test Physics, Chemistry,Mathematics and Telecommunication For SI And ASI telecom
A Practice paper For SI telecom and ASI telecom Consisting of
60 Questions on Physics, Chemistry,Mathematics and Telecommunication

Physics

1. Choose the wrong statement.

(a) l kg wt=9.8N

(b) Momentum is a vector quantity

(c) Force is always conserved

(d) Momentum is conserved in the absence of an external force

Ans. (b)

2. If a rock is brought from the surface of the moon

(a) its mass will change

(b) its weight will change, but not mass

(c) both mass and weight will change

(d) its mass and weight will remain the same

Ans. (b)

3. The weight of a body would not be zero

(a) at the centre of the earth

(b) during a free fall

(c) in interplanetary space

(d) on a frictionless surface

Ans. (d)

4. A man is standing on a boat in still water. If he walks towards the shore the boat will

(a) move away from the shore

(b) remain stationary

(c) move towards the shore

(d) sink

Ans. (a)

5. A driver accelerates his car first at the rate of 1.8 m/s² and then at the rate of 1.2 m/s². The ratio of the forces exerted by the engines will be respectively equal to

(a) 2:3

(b) 1:2

(c) 2:1

(d) 3:2

Ans. (d)

6. During a planned manoeuvre in a space flight, a free-floating astronaut A pushes another free- floating astronaut B, the mass of A being greater than that of B. Then, the magnitude of the force exerted by astronaut A on astronaut B is

(a) equal to zero

(b) equal to the force exerted by B on A

(c) greater than the force exerted by B on A

(d) less than the force exerted by B on A

Ans. (b)

7. In the above problem, during a push

(a) the acceleration of A is greater than that of B

(b) the acceleration of A is less than that of B

(c) neither is accelerated

(d) their accelerations are equal in magnitude but opposite in direction

Ans. (b)

8. The force needed to produce an acceleration of 6 m/s² in a ball of mass 4 kg will be

(a) 24N

(b) 30N

(c) 32N

(d) 36N

Ans. (a)

9. The SI unit of density is

(a) kg m^-3

(b) g cm^-3

(c) kg wt cm^-2

(d) none of these

Ans. (a)

10. Two spheres of the same size are made of the same metal, but one is hollow

and the other is solid. They are heated to the same temperature. Then,

(a) the hollow sphere will expand more

(b) the solid sphere will expand more

(c) both spheres will expand almost equally

(d) only the solid sphere will expand

Ans. (c)

11. When an inflated type bursts, the air escaping out

(a) will get heated up

(b) will be cooled

(c) will not undergo any change in its temperature

(d) will be liquefied

Ans. (b)

12. When the momentum of a body increases by 10%. its K.E. increases by

(a) 20%

(b) 40%

(c) 44%

(d) none of these

Ans. (d)

13. Watt sec represents the unit for

(a) energy

(b) power

(c) force

(d) none of these

Ans. (a)

14. The atomic number of an element is determined by

(a) The number of electrons in one atom

(b) The number of neutrons in one atom

(c) The valency of the element

(d) The number of protons in one atom

Ans. (a)

15. The value of e/m of an electron was measured by:

(a) Millikan

(c) Dalton

(b) J.J. Thomson

(d) Rutherford

Ans. (a)

Chemistry

16. Which of the following is not a noble gas?

(a) Helium

(b) Xenon

(c) Radium

(d) Radon

Ans. (c)

17. Which of the following properties generally decrease along a period?

(a) Ionization energy

(b) Electron affinity

(c) Metallic character

(d) Valency

Ans. (c)

18. The elements in the middle of the periodic table are called

(a) Metalloids

(b) Transition elements

(c) Rare earth element

(d) Noble gases

Ans. (b)

19. The fractional distillation of coal tar yields

(a) Carbon disulphide

(b) carbon tetrachloride

(c) Kerosene oil

(d) Benzene

Ans. (d)

20. The formula of ethyne is

(a) C₂H₂

(b) C₆H₆

(c) C₂H₄

(d) C₂H₆

Ans. (a)

21. Water gas consists of

(a) Water vapour and coal dust

(b) a mixture of carbon monoxide and hydrogen

(c) a mixture of carbon monoxide and nitrogen

(d) Water vapour and methane

Ans. (b)

22. The reaction of one mol of bromine with ethyne yields

(a) BrCH₂—CH₂Br

(b) BrCH = CHBr

(c) Br₂CH—CHBr₂

(d) CH₃—CH₂Br

Ans. (b)

23. The main constituent of LPG is

(a) Methane

(b) Ethane

(c) Propane

(d) Butane

Ans. (d)

24. The general formula to represent alkenes is

(a) C_nH_2n+1

(b) C_nH_2n

(c) C_nH_2n+2

(d) C_nH_2n-2

Ans. (c)

25. Molecular mass of Butane is

(a) 54

(b) 56

(c) 58

(d) 60

Ans. (c)

26. Which of the following ions is furnished by acids in aqueous solution?

(a) OH^- ions

(b) H⁺ ions

(c) H₃O⁺ ions

(d) None of these

Ans. (b)

27. Which of the following is not an organic acid?

(a) Tartaric acid

(b) Oxalic acid

(c) Ascorbic acid

(d) Nitric acid

Ans. (d)

28. Acids turn blue litmus

(a) Green

(b) Red

(c) Yellow

(d) orange

Ans. (b)

29. Acidity of aluminum hydroxide is

(a) l

(b) 2

(c) 4

(d) 3

Ans. (d)

30. pH of tomato juice is 4, that means it is

(a) basic

(b) acidic

(c) neutral

(d) none of these

Ans. (b)

Maths

31. A man loses 12% of his money and after spending 70% of the remainder, he was left

with Rs 210. The money that he had at the beginning is

(a) Rs 810

(b)Rs 800

(c) Rs 790

(d) Rs 780

Ans. (b)

32. The salaries of A, B and C together amount to Rs 333, if they spend 80%, 85% and

75% of their respective salaries. If their savings are 7 : 6 : 9, then their respective

salaries are

(a) Rs 102, Rs 118, Rs 113

(b) Rs 105, Rs 120, Rs 108

(c) Rs 85, Rs 125, Rs 123

(d)  none of these

Ans. (b)

33. In an examination, 34% of the candidates fail in Arithmetic and 42% in English. If

20% fail in Arithmetic and English, the percentage of those passing in both subjects is

(a) 44

(b) 45

(c) 46

(d) 47

Ans. (a)

34. A person purchases 20 litres of juice at Rs 2.20 per litre and diluted it with water to

make the contents 22 litres. In order to earn 10 % profit he should sell the juice at

(a) Rs 2.20

(b) Rs 2.00

(c) Rs 2.35

(d) Rs 2.40

Ans. (a)

35. A man deposited Rs 8,000 in a bank for 3 years at 5% per annum compound interest.

After 3 years he will get

(a) Rs 8,800

(b) Rs 9,000

(c) Rs 9,200

(d) Rs 9,261

Ans. (d)

36. A person walks from his house at a speed of 4 km/hr and reaches his school 5 minutes

late. If his speed has been 5 km/hr, he would have reached 10 minutes earlier. The

distance of the school from his house is

(a) 5km

(b) 6km

(c) 7km

(d) 8km

Ans. (a)

37. A sum of money at compound interest becomes double of itself in 15 yrs. The rate of

interest is

(a) 5.1%

(b) 5%

(c) 4.7%

(d) 4.8%

Ans. (c)

38. A man sells two horses at0the same price. On one he makes a profit of 10% and on

the other he suffers a loss of 10%. On the whole he

(a) makes no profit no loss

(b) makes a profit of 1%

(c) suffers a loss of 1%

(d) suffers a loss of 2%

Ans. (c)

39. 3 men can do as much work as 5 women 10 children. If 40 children can finish

work in 7 days, then 6 men, 5 women and 5 children will finish the same work in

(a) 8 days

(b) 9 days

(c) 10 days

(d) none

Ans. (a)

40.  90 km per hour is same as

(a) 50 m/sec

(b) 25 m/sec

(c) 25 m/min

(d) 50 m/min

Ans. (b)

41. The solution of the differential equation

d²y/dx² – 2dy/dx + y = 0 is -

(a) y = (c₁ + c₂x)e^x

(b) y = c₁e^x

(c) y = x e ^x

(d) None of these

Ans. (a)

42. The number of non-empty subsets of the set

{1, 2, 3, 4} is—

(a) 16

(b) 12

(c) 15

(d) 8

Ans. (c)

43. The tangent to the curve x²/a² + xy²/b² = 1 at the point (a, 0) -

(a) Makes an angle of 30° with x-axis

(b) Is parallel to x-axis

(c) Makes an angle of 45° with x-axis

(d) Is perpendicular to x-axis

Ans. (d)

44. The expression (sin ø + cos ø) has the maximum value, when ø is equal to—

(a) 30°

(b) 45°

(c) 60°

(d) 90°

Ans. (b)

45. The number log₂ 7 is—

(a) An integer

(b) A rational number

(c) An irrational number

(d) A prime number

Ans. (c)

Communication

46.In frequency modulation, frequency is

a. constant

b. zero

c. variable

d.one

Ans:c

47.  In frequency modulation, amplitude is

a.constant

b.zero

c.one

d.variable

Ans:a

48.  FSK is

a)      frequency shift keying

b)      frequency shine keying

c)      frequency shine keyboard

d)     none of these

Ans:a

49. The frequency range of 1GHZ to 30GHZ are referred as

a)      sound waves

b)      micro waves

c)      mini waves

d)     none of these

Ans:b

50.  Discrete signal is represented by

a)      coding

b)      modulation

c)      demodulation

d)     sequence of samples

Ans:d

51.In amplitude modulation, frequency is

a)      constant

b)      zero

c)      variable

d)     one

Ans:a

52. Low pass filter attenuates

a)      high frequencies

b)      low frequencies

c)      medium frequencies

d)     none of these

Ans:a

53. Micro wave communication is used in

a)      TNEB

b)      telephone networks

c)      industries

d)     none of these

Ans:b

54. In optical communication, carrier is

a)      electromagnetic waves in optical frequency

b)      electromagnetic waves in maximum frequency

c)      electromagnetic waves in minimum frequency

d)     none of these

Ans:a

55.  Optical fibre is fabricated by

a)      glass

b)      copper

c)      aluminium

d)     none of these

Ans:a

56.which one of the following is  the type of ‘superheterodyning’

a.Radio transmitter

b.TV

c.radio receiver

d.radar

Ans:c

57.Primary colours are

a.red,blue.green

b.green,white.blue

c.blue,red.yellow

d.none of these

Ans:a

58. Sound signals in TV are

a)      amplitude modulated

b)      dc modulated

c)      frequency modulated

d)     a and c

Ans:c

59.Communication is a process of

a)      transfer of information

b)      transfer of energy

c)      transfer of channel

d)     none of these

Ans:a

60.  Modulation index is

a)      Vm/Vc

b)      Vc/Vm

c)      Vm/Ic

d)     None of these

Ans:a

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