General Science Practice Question and Answer
8 Q: Litmus is obtained from-
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63b6c63d61d62119f1a1daaa- 1from bacteriafalse
- 2from algaefalse
- 3from fungusfalse
- 4from lichentrue
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Answer : 4. "from lichen"
Explanation :
Litmus is obtained from lichens, which are composite organisms formed from a symbiotic relationship between a fungus and an alga or cyanobacterium. Litmus is a water-soluble mixture of different dyes extracted from lichens, primarily Roccella tinctoria and Roccella fuciformis. It is commonly used as a pH indicator in laboratories to test the acidity or alkalinity of solutions.
Q: The theory of origin of life on earth is proposed by:
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6023f4dbe4d6c265698fb5ef- 1Harold C. Ureyfalse
- 2Lamarckfalse
- 3Haldanetrue
- 4Stanley Millerfalse
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Answer : 3. "Haldane "
Q: Who invented the rabies vaccine?
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61b1d71479954245bc06024a- 1Hanfree Davyfalse
- 2Charles Darwinfalse
- 3Lewis Pasteurtrue
- 4none of thesefalse
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Answer : 3. "Lewis Pasteur"
Q: Light sensitive salts Metal is___.
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5fc881ec907913387b04c687- 1Zincfalse
- 2Silvertrue
- 3Copperfalse
- 4Aluminiumfalse
- 5Ironfalse
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Answer : 2. "Silver"
Q: The time period of a vibrating body is 0.04s, then the frequency of the wave is___.
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6082682660a06a7ffdaa7112- 125Hztrue
- 220Hzfalse
- 3250Hzfalse
- 4200Hzfalse
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Answer : 1. "25Hz"
Q: Read following statement carefully and answer which statement is not correct about Venus-
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602e2a51bb9bb966a304b74e- 1Venus rotates west to east on its axistrue
- 2Venus is known as morning starfalse
- 3it is the hottest planet of solar family as well as it is known as shining star.false
- 4venus is known as Godess of love in Greek.false
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Answer : 1. "Venus rotates west to east on its axis"
Q: Instrument for measuring rainfall is called –
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605c507740a8e9659411fb9d- 1Lucimeterfalse
- 2Galactometerfalse
- 3Hyetometertrue
- 4Hygrometerfalse
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Answer : 3. "Hyetometer"
Q: Amphoteric oxide is-
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63bd21ef74eba5069d47d79a- 1aluminumfalse
- 2zinc oxidefalse
- 3Both A and Btrue
- 4None of thesefalse
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Answer : 3. "Both A and B"
Explanation :
An amphoteric oxide is a type of oxide that can act as both an acid and a base. This means it can react with both acids and bases, either accepting or donating protons (H⁺ ions) depending on the pH of the solution. Amphoteric oxides exhibit this dual behavior because they have both acidic and basic properties. Aluminum oxide (Al₂O₃) and zinc oxide (ZnO) are examples of common amphoteric oxides.