General Science

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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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Pipes and Cistern

Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A s opened first, in how many hours, the tank shall be full?

A large tanker can be filled by two pipes A and B in 60 min and 40 min respectively. How many minutes will it take to fill the tanker from empty state if B is used for first half of the time, and A and B fill it together for the other half?

A tank is filled by 3 pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The 2nd pipe fills the tank 5 hours faster than first pipe and 4 hours slower than third pipe. The time required by first pipe is?

Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?

Two pipes A and B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min?

Two pipes A and B can fill a tank in 36 min and 45 min respectively. A water pipe C can empty the tank in 30 min. First A and B are opened. after 7 min, C is also opened. In how much time, the tank is full?

Two pipes can fill a cistern in 14 hours and 16 hours respectively. The pipes are opened simultaneously and it is found that due to leakage in the bottom it took 32 min more to fill the cistern. When the cistern is full, in what time will the leak empty it?

Bucket P has thrice the capacity as Bucket Q. It takes 60 turns for Bucket P to fill the empty drum. How many turns it will take for both the buckets P and Q, having each turn together to fill the empty drum?

Probability

In a class , 30 % of the students offered English, 20 % offered Hindi and 10 % offered Both.If a student is offered at random, what is the probability that he has offered English or Hindi?

In a lottery ,there are 10 prizes and 25 blanks.A lottery is drawn at random. what is the probability of getting a prize ?

Two dice are thrown simultaneously .what is the probability of getting two numbers whose product is even?

Two diced are tossed the probability that the total score is a prime number?

Two cards are drawn at random from a pack of 52 cards What is the probability that either both are black or both are queens?

Two dice are thrown together .What is the probability that the sum of the number on the two faces is divisible by 4 or 6?

A bag contains 6 white and 4 black balls .Two balls are drawn at random .Find the probability that they are of the same colour?

In a simultaneous throw of a pair of dice,find the probability of getting a total more than 7?

An unbiased die is tossed.Find the probability of getting a multiple of 3?

Problems on Ages

My brother is 3 years elder to me. My father was 28 years of age when my sister was born while my mother was 26 years of age when i was born. If my sister was 4 years of age when my brother was born,then what was the age my father and mother respectively when my brother was born?

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