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Table of Contents

Jharkhand Polytechnic Previous Years Question Papers

Question 2: The main source of aromatic compounds is

Fruit

Winter green oil

Petroleum

Ant

Answer: 3

Question 3: The slow chemical process of making coal from wood is called:

decomposition

oxidation

Distillation

Carbonization

Answer: 1

Question 4:Â If the ratio of the second and third term in the expansion of (a + b)2 is equal to the ratio of the third and fourth term in the expansion of (a + b ) n+3 then the value of n is equal to :

8

7

5

3

Answer:Â 3

Question 5: The equation of line which is parallel to the straight line 3x + 4y â€“ 7 = 0 and passing through (1,2) is :

3x + 4y = 11

3x+4y+11= 0

4x-3y+2=0

3x+4y+7=0

Answer: 4x-3y+2=0

Question 6: A dice is thrown then the probability that the sum of the number is 1 or 6 is:

1/5

1/3

2/5

3/4

Answer: 1/3

Question 7: The sum of 20 terms of the series 1 + 4 + 7 + 10 +â€¦.is:

290

490

590

none of these

Answer: 590

Question 8: Which is correct for inside charged sphere?

E â‰ 0, V = 0

E=0, V= 0

Eâ‰ 0, Vâ‰ 0

E=0, V = 0

Answer: E=0, V = 0

Question 9:Â The function of a grid in a triode is:

to increase plate voltage

to decrease plate voltage

reduce the effect of space charge

None

Answer:Â to increase plate voltage

Question 10:Â The wavelengths associated with photons and electrons are the same, the ratio of their momentum will be:

1: 1

2: 1

1: 4

3: 2

Answer: 1

Question 11: Of which the velocity is equal to light velocity:

Cathode ray

X-rays

positive ray

all

Answer: X-rays

Question 12:Â If the pressure of a gas is doubled at a constant temperature, then the velocity of sound in the gas becomes:

unchanged

âˆš2 times

half

double

Answer: unchanged

Question 13:Â Which quantity doesnâ€™t remain constant in simple harmonic motion:

Time period

velocity

frequency

amplitude

Answer: velocity

Question 14: Brasses and bronzes are welded using

carburising flame

oxidizing flames

reducing flame

neutral flame

Answer: 4

Question 15: In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant, approximately what percentage of the selling price is the profit?

30%

70%

100%

250%

Answer: 2

Question 16: A shopkeeper expects a gain of 22.5% on his cost price. If in a week, his sale was of Rs. 392, what was his profit?

18.20

70

72

88.25

Answer: 3

Question 17: On selling 17 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is:

45

50

55

60

Answer: 4

Question 18: The main chemical constituent of clay is

silicon oxide

aluminium borosilicate

zeolites

aluminium silicate

Answer: 4

Question 19: The percentage profit earned by selling an article for Rs. 1920 is equal to the percentage loss incurred by selling the same article for Rs. 1280. At what price should the article be sold to make 25% profit?

2000

2200

2400

Data inadequate

Answer: 3

Question 20: Supersonic plane fly with the speed

less than the speed of sound

of sound

greater than the speed of sound

of light

Answer: 3

Question 21: Rainbow is due to

absorption of sunlight in minute water droplets

diffusion of sunlight through water droplets

ionisation of water deposits

refraction and reflection of sunlight by water droplets

Answer: 4

Question 22:Â Stars that appear single to the naked eye but are double when seen through a telescope are

novas and supernovas

binaries

asteroids

quasars

Answer: 2

Question 23: The hardest form of carbon is

coke

graphite

diamond

charcoal

Answer:Â 3

Question 24: The main active constituent of tea and coffee is

nicotine

chlorophyll

caffeine

aspirin

Answer:Â 3

Question 25:Â How does the size of the pupil become in strong light?

(A) Big

(B) Small

(C) No change

(D) None of these

Answer: Option (B)

Question26:Â Kilowatt-hour is the unit of?

(A) Electricity of charge

(B) Energy

(C) Potential difference electricity

(D) Power

Answer: Option (B)

Question27:Â The glasses of a person with nearsightedness are put in?

(A) Convex lens

(B) Cylindrical lens

(C) Bifocal lens

(D) Concave lens

Answer: Option (D)

Question28:Â What is in the human eye?

(A) Concave lens

(B) Convex mirror

(C) Convex lens

(D) Concave mirror

Answer: Option (C)

Question29:Â What is the filament of an electric bulb?

(A) Copper

(B) Platinum

(C) Tungsten

(D) None of these

Answer: Option (C)

Question30:Â The part of the eye on which the image of an object falls, is called?

(A) Cornea

(B) Retina

(C) Iris

(D) Pupil

Answer: Option (B)

Question31:Â Which color is visible at the time of sunrise and sunset?

(A) Red

(B) Blue

(C) Black

(D) Yellow

Answer: Option (A)

Question32:Â What is the SI unit of a magnetic field?

(A) Newton

(B) Tesla

(C) Ampere

(D) Meter

Answer: Option (B)

Question33:Â What type of current is received from the dynamo?

(A) Direct section

(B) Alternating Current

(C) Both Sections

(D) None of these

Answer: Option (A)

Question34:Â What is the unit of resistivity?

(A) Ohm/meter

(B) Ohm-meter

(C) Meter

(D) None of these

Answer: Option (B)

Question35:Â The device for generating electric current is called?

(A) Ammeter

(B) Galvanometer

(C) Generator

(D) Meter

Answer: Option (C)

Question36:Â The glasses of a person with long-sightedness are fitted in?

(A) Concave lens

(B) Bifocal lens

(C) Convex lens

(D) Cylindrical lens

Answer: Option (C)

Question37:Â The point in the human eye which is not at all sensitive to light is called?

(A) Pit point

(B) Blind Point

(C) Near Point

(D) Far Point

Answer: Option (B)

Question38:Â What type of image is formed on a cinema screen?

(A) Virtual image

(B) Real image

(C) Both

(D) All the statements are true

Answer: Option (B)

Question39:Â What type of spectrum is a rainbow?

(A) Natural spectrum

(B) Artificial spectrum

(C) Artificial spectrum and natural spectrum

(D) All the statements are true

Answer: Option (A)

Question40:Â What does the color of the sky look like when traveling in an aircraft at high altitude?

(A) Red

(B) Black

(C) Yellow

(D) Blue

Answer: Option (B)

Question41:Â The far point of the normal human eye is?

(A) at 25 cm

(B) at 25 m

(C) at 25 mm

(D) at infinity

Answer: Option (D)

Question42:Â Which color is used in the danger signal?

(A) Yellow color

(B) Violet color

(C) Blue color

(D) Red color

Answer: Option (D)

Question43:Â What is the approximate time difference between the actual sunset and the virtual sunset?

(A) 2 minutes

(B) 1 minute

(C) 4 minutes

(D) 3 minutes

Answer: Option (A)

Question44:Â Eyes with farsightedness can clearly see?

(A) Nearby objects

(B) Big things

(C) Distant objects

(D) None of these

Answer: Option (C)

Question45:Â In how many different ways can the letters of the word â€˜CORPORATIONâ€™ be arranged so that the vowels always come together?

810

1440

2880

50400

5760

Answer: Option 4

Question46:Â Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10, and 12 seconds respectively. In 30 minutes, how many times do they toll together?

4

10

15

16

Answer: Option 4

Question47:Â If 3^{(xÂ â€“Â y)}Â = 27 and 3^{(xÂ +Â y)}Â = 243, thenÂ xÂ is equal to:

0

2

4

6

Answer: Option 3

Question48:Â A man has Rs. 480 in the denominations of one-rupee notes, five-rupee notes and ten-rupee notes. The number of notes of each denomination is equal. What is the total number of notes that he has?

45

60

75

90

Answer: Option 4

Question49:Â The higher the wind speed and the longer the fetch or distance of open water across which the wind blows and waves travel, the ____ waves and the ____ energy they process.

larger, more

larger, less

smaller, more

smaller, less

Answer: Option 1

Question50:Â What did J. B. Dunlop invent?

Pneumatic rubber tire

Automobile wheel rim

Rubber boot

Model airplanes

Answer: Option 1

Question51:Â Number of moles of MnO4- required to oxidize one mole of ferrous oxalate completely in the acidic medium will be

2 moles

6 moles

4 moles

5 moles

Answer: Option 2

Question52:Â Radiocarbon is produced in the atmosphere as a result of

collision between fast neutrons and nitrogen nuclei present in the atmosphere

action of ultraviolet light from the sun on atmospheric oxygen

action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere

lightning discharge in atmosphere

Answer: Option 1

Question53:Â Nuclear sizes are expressed in a unit named

Fermi

angstrom

newton

tesla

Answer: Option 1

Question54:Â Lux is the SI unit of

intensity of illumination

luminous efficiency

luminous flux

luminous intensity

Answer: Option 1

Question55:Â Point A is at a lower electrical potential than point B. An electron between them on the line joining them will

move towards A

move towards B

move at right angles to the line joining A and B

remain at rest

Answer: Option 2

Question56:Â The high reactivity of fluorine is due to

its high electro negativity

small size of fluorine atom

availability of d-orbitals

strong F â€“ F bond

Answer: Option 1

Question57:Â The iron ore magnetite consists of

Fe2O3

Fe3OH4

FeCO3

3H2O

Answer: Option 1

Question58:Â The main chemical constituent of clay is

silicon oxide

aluminium borosilicate

zeolites

aluminium silicate

Answer: Option 4

Question59:Â The main use of salt in the diet is to

make the taste of food better

produce in small amounts the hydrochloric acid required for the digestion of food

ease the process of cooking

increase the solubility of food particles in water

Answer: Option 2

Question60:Â In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant, approximately what percentage of the selling price is the profit?

30%

70%

100%

250%

Answer:Â Option 2

Question61:Â A, B, C subscribes Rs. 50,000 for a business. A subscribes Rs. 4000 more than B and B Rs. 5000 more than C. Out of a total profit of Rs. 35,000, A receives:

8400

11,900

13,600

14,700

Answer: Option 4

Question62:Â The equation of parabola which passes through the intersection of a straight line x + y = 0 and the circle x2 + y2 + 4y = 0 is:

y2 = 4x

y2 = x

y2 = 2x

none of these

Answer: Option 3

Question63:Â Sin A. Sin B, Cos A are in GP, Roots of x2 + 2 x cot B + 1 = 0 are always:

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