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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 |
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. |