Which one of the following is a non-metallic mineral ?
- A.Iron
- B.Mica
- C.Copper
- D.Bauxite
Correct answer
Explanation
The correct answer is B, Mica. Mica is a non-metallic mineral, a silicate that splits into thin, clear, flexible sheets, and no metal is extracted from it. Mica is an excellent insulator of heat and electricity, so it is used in electrical and electronic equipment, condensers and heating elements. India is among the leading producers of sheet mica, with the main belt in Koderma and Giridih in Jharkhand and in Nellore in Andhra Pradesh, along with parts of Rajasthan. Other non-metallic minerals include limestone, gypsum and dolomite. Option A is wrong because iron is a metal, obtained from ores such as haematite and magnetite. Option C is wrong because copper is a metal, mined mainly in the Khetri belt of Rajasthan and Singhbhum in Jharkhand. Option D is wrong because bauxite is the ore of aluminium, so it counts as a metallic mineral. Exam tip: mica = non-metallic insulator, Koderma (Jharkhand); bauxite = aluminium ore.
Practice Questions
View allD had recently visited Khardung La, Nubra Valley and several Buddhist monasteries. Which one of the following States / UT had she visited ?
- A.Himachal Pradesh
- B.Uttarakhand
- C.Sikkim
- D.Ladakh
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Khardung La, the Nubra Valley and monasteries such as Hemis, Thiksey and Diskit all lie in Ladakh, which became a separate Union Territory in 2019.
Read the full explanation →Consider the following statements about clouds : 1. Two major forms of clouds are stratiform and cumuliform. 2. According to the altitude, clouds are classified as high clouds, middle clouds and low clouds. 3. Stratus, nimbostratus and stratocumulus are types of high clouds. 4. Clouds having nimbo attached to their name produce precipitation. Which of the statements given above are correct ?
- A.1 and 2 only
- B.1, 2 and 4
- C.2 and 4 only
- D.1, 3 and 4
Show answer
Only statement 3 is wrong, because stratus, nimbostratus and stratocumulus are low clouds, not high clouds. Statement 1 is correct: clouds take two basic forms, layered stratiform sheets formed by gentle lifting of air and heaped cumuliform clouds formed by rising convection currents.
Read the full explanation →Which one of the following pairs of City and Lake is not correctly matched ?
- A.Buffalo : Erie
- B.Detroit : Superior
- C.Milwaukee : Michigan
- D.Toronto : Ontario
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Detroit stands on the Detroit River, which links Lake St. Clair to Lake Erie, and is far from Lake Superior.
Read the full explanation →Which of the following statements is/are correct with respect to Time Zone in India ? 1. There is one standard time for the whole country. 2. Andaman and Nicobar Islands and Lakshadweep Islands have different Time Zones. 3. Indian Standard Time (IST) is five and half hours behind GMT. Select the correct answer using the code given below:
- A.1 only
- B.2 only
- C.1 and 2 only
- D.1 and 3 only
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India follows a single standard time, Indian Standard Time, for the whole country, and it is ahead of GMT, not behind it.
Read the full explanation →Which one of the following is not a resultant of the El Nino effect ?
- A.Distortion of equatorial atmospheric circulation
- B.Flow of the South-East Trade Winds towards the Indian Ocean
- C.Irregularities in the evaporation of sea water
- D.Reduction in the amount of planktons which reduces the number of fish in the sea
Show answer
During El Nino the trade winds of the Pacific weaken or even reverse, so a steady flow of these winds is not one of its results.
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