General Science

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Which of the following causes the least pollution when burnt ?

A)
Petrol

B)
Diesel

C)
Coal

D)
Natural gas


Correct Answer :

Natural gas


Explanation :

Among the list of fossil fuels, natural gas is considered to be the least polluting fuel, produce less carbon dioxide per joule delivered than either coal or oil.

The main constituent of CNG is?

A)
Methane

B)
Butane

C)
Ethane

D)
Propane


Correct Answer :

Natural gas


Explanation :

Compressed Natural Gas (CNG) is a fuel which can be used in place of gasoline (petrol), Diesel . And is composed primarily of methane (91.9%) compressed at a pressure of 200 to 248 bars but may also contain ethane, propane and heavier hydrocarbons.
LPG is Liquefied Petroleum Gas, a mixture of propane and butane liquefied at 15 °C and a pressure of 1.7 - 7.5 bar.

Maximum temperature that can be obtained in a box type solar cooker is?

A)
2000C

B)
1400C

C)
800C

D)
2500C


Correct Answer :

1400C


Explanation :

The box type solar cooker consists of a rectangular box insulated on the bottom and sides & having two glass covers on the top. A single glass reflector whose inclination can be varied with the attachment to the box. Temperature up to 150 deg C can be reached in the cooker. But food containing water can be heated up to 100 deg C.

What is the audible range (hearing range) of humans?

A)
20 Hz - 20000 Hz

B)
80 Hz-100 Hz

C)
2 lac Hz - 4 lac Hz

D)
0 Hz-20 Hz


Correct Answer :

20 Hz - 20000 Hz


Explanation :

The human ear can respond to minute pressure variations in the air if they are in the audible frequency range, roughly 20 Hz - 20 kHz.

The synthesis of food in plants takes place in the_________?

A)
Roots

B)
Leaves

C)
Stem

D)
Fruit


Correct Answer :

Leaves


Explanation :

Plants make food in their leaves. The leaves contain a pigment called chlorophyll, which colors the leaves green. Chlorophyll can make food the plant can use from carbon dioxide, water, nutrients, and energy from sunlight. This process is called photosynthesis.

Temperature in pasteurization is?

A)
72o C

B)
35.7o C

C)
56o C

D)
60.8o C


Correct Answer :

72o C


Explanation :

for Pasteurization of milk, the higher temperature 72° C (162° F) is required for 15 seconds , or alternatively the temperatures of about 63° C (145° F) is required for 30 minutes

Which planet has the longest day in our solar system?

A)
Mercury

B)
Saturn

C)
Venus

D)
Earth


Correct Answer :

Venus


Explanation :

Venus has the longest day of any planet in our solar system. It completes one rotation every 243 days of the earth.

Laughing gas is also called as?

A)
Hydrogen dioxide

B)
Sulphur dioxide

C)
Hydrogen peroxide

D)
Nitrous oxide


Correct Answer :

Nitrous oxide


Explanation :

Nitrous oxide(N2O), also called dinitrogen monoxide, laughing gas, or nitrous, is a chemical compound with the formula N2O. At room temperature, it is a colorless, odorless non-flammable gas with a slightly sweet taste. It is used in surgery and dentistry for its anaesthetic and analgesic effects.

Which Pigment in the skin of human beings protects the body from U.V radiation of Sun?

A)

Haemoglobin


B)

Chlorophyll


C)

Melanin


D)

Thyroxine



Correct Answer :

Melanin


Explanation :

In human skin, melanin are pigments that color our eyes, hair and skin.

Melanin darkens the skin and acts as a barrier to the sun.It is an effective absorbent of light and able to absorbed 99.9% UV radiation.

Which pollutant is present in Cigarette smoke?

A)

NO2


B)

Hb


C)

CO


D)

All of these



Correct Answer :

CO


Explanation :

Cigarette smoke contains thousands of chemical compounds. Some of the chemicals found in tobacco smoke include-

Nicotine
Hydrogen cyanide
Formaldehyde
Lead
Arsenic
Ammonia
Benzene
Carbon monoxide
Tar

Smallpox, cholera, tuberculosis(TB) and dysentery diseases are caused by?

A)

Air pollution


B)

Soil Pollution


C)

Water pollution


D)

Noise pollution



Correct Answer :

Water pollution

Vacuum cleaner was invented by ?

A)

William Cooke


B)

Hubert Cecil Booth


C)

Baltzar Von Platen


D)

Carl Munters



Correct Answer :

Hubert Cecil Booth


Explanation :

Hubert Cecil Booth (1871 - 1955) was a British engineer who and inventor of the first powered vacuum cleaner.

Study of 'Old age and Aging' is known as ?

A)

Oncology


B)

Gerontology


C)

Teratology


D)

Recrology



Correct Answer :

Gerontology


Explanation :

Gerontology is the study of aging and older adults. It includes, the study of physical, mental, and social changes in older people as they age.

Nitrous Oxide is popularly known as?

A)

Tear gas


B)

Cleanser gas


C)

Laughing gas


D)

Deoxidiser gas



Correct Answer :

Laughing gas


Explanation :

Nitrous oxide(N2O), also called dinitrogen monoxide, laughing gas, or nitrous, is a chemical compound with the formula N2O. At room temperature, it is a colorless, odorless non-flammable gas with a slightly sweet taste. It is used in surgery and dentistry for its anaesthetic and analgesic effects.

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An aeroplane flying at a height of 300 m above the ground passes vertically above another plane at an instant when the angles of elevation of the two planes from the same point on the ground are 60º and 45º respectively. What is the height of the lower plane from the ground?

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Trigonometry

What is the value of sinx √( 1 /1+cosx + 1 /1-cosx ) ?

What is cos4 A - sin4 A / cos2 A - sin2 A equal to?

If 7sin2 x +3cos2 x = 4, 0 < x < 90º ,then what is the value of tan x?

If x = a cosθ + b sinθ and y = a sinθ - b cosθ then what is x2 + y2 equal to?

Average

The mean of 5 numbers is 15. If one more number is included, the mean of the 6 numbers becomes 17. What is the included number?

The mean marks obtained by 300 students in a subject are 60. The mean of top 100 students was found to be 80 and the mean of last 100 students was found to be 50. The mean marks of the remaining 100 students are?

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Let a, b, c, d, e, f, g be consecutive even numbers and j, k, l, m, n be consecutive odd numbers. What is the average of all the numbers?

Alligation or Mixture

25 kg of alloy X is mixed with 125 kg of alloy Y. If the amount of lead and tin in the alloy X is the ratio 1 : 2 and the amount of lead and tin in the alloy Y is in the ratio 2 : 3, then what is the ratio of lead to tin in the mixture?

Simplification

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