July 12, 2024
A phenomenon in which an element exists in different modification in same physical state is called
  • (A) Isomerism
  • (B) Allotropy
  • (C) Catenation
  • (D) Crystallinity
Consider the following statement Regarding CO :
1. Main component of water gas (CO+H2).
2. highly toxic
3. Highly soluble in water.
Which of the statement is/are correct:
  • (A) Only 1 and 3
  • (B) Only 2 and 3
  • (C) Only 1 and 2
  • (D) All of these
Consider the following statement Regarding Diamond :
1. Soft , slippery to touch and opaque.
2. It is a non-conductor of heat and electricity
3. Each carbon has four covalent bonds
Which of the statement is/are correct:
  • (A) Only 1 and 3
  • (B) Only 2 and 3
  • (C) Only 1 and 2
  • (D) All of these
Which of the following statements is wrong about detergents?
  • (A) It is a sodium salt of long chain fatty acids
  • (B) It is sodium salts of sulphonic acids
  • (C) The ionic part in a detergent is –SO3–Na+
  • (D) It is effective even in hard water.
Consider the following statement Polystyrene :
1 Polystyrene is a thermosetting plastic.
2. Styrene is a building block of this plastic.
3. It is Biodegradable
Which of the statement is/are correct:
  • (A) Only 1 and 3
  • (B) Only 2
  • (C) Only 2 and 3
  • (D) All of these
PET is the acronym for ____________
  • (A) Polyester
  • (B) Polyester and terylene
  • (C) Polyethylene terephthalate
  • (D) Polyetheneterylene
Assertion: Detergents are more effective cleansing agents than soaps in hard water.
Reason: Calcium and magnesium salts of detergents are water soluble
  • (A) If both assertion and reason are true and reason is the correct explanation of assertion.
  • (B) If both assertion and reason are true but reason is not the correct explanation of assertion.
  • (C) If assertion is true but reason is false.
  • (D) If assertion is false but reason is true.
A: It takes a very long time for nylon clothes to breakdown into microfibers but cotton clothes need only six months to decompose.
R: Nylon made out of petrochemicals is non-biodegradable and cotton cloth is biodegradable.
  • (A) If both assertion and reason are true and reason is the correct explanation of assertion.
  • (B) If both assertion and reason are true but reason is not the correct explanation of assertion.
  • (C) If assertion is true but reason is false.
  • (D) If assertion is false but reason is true.
Which one of the following is not an allotrope of carbon?
  • (A) Coal
  • (B) Diamond
  • (C) Graphite
  • (D) Graphene
Which one among the following nontoxic gases helps in formation of enzymes which ripen fruit?
  • (A) Acetylene
  • (B) Ethane
  • (C) Methane
  • (D) Carbon dioxide
With reference to ecological pyramids, consider the following statements:
1. In an aquatic ecosystem, the pyramid of biomass is always upright.
2. In all ecosystems of the world, the pyramid of numbers is always upright.
3. In a terrestrial ecosystem, the pyramid of energy is always inverted.
  • (A) 1, 2 and 3
  • (B) 1 and 2 only
  • (C) 1 only
  • (D) None
Which of the following statements is/are correct with respect to adaptations of Desert plants and animal under hot and dry conditions?
1. Leaves of Desert Plants are absent or reduced in size.
2. Animals are nocturnal in habit to avoid the sun’s heat during day time
3. Animals and birds usually have long legs to keep the body away from the hot ground.
Select the correct answer using options given below:
  • (A) 1 only
  • (B) 1 and 2 only
  • (C) 1 and 3 only
  • (D) All of the Above
Primary Ecological Succession Occurs on
1. grazed areas
2. new islands created by volcanic eruptions:
3. sand dunes
4. Where glaciers have retreated
5. burned areas
Select the correct answer using the codes given below:
  • (A) Only 1 and 5
  • (B) Only 2, 3 and 4
  • (C) Only 1, 4 and 5
  • (D) 1, 2, 3, 4 and 5
Which of the following are the climatic conditions are necessary for tropical moist deciduous forests?
1. Annual rainfall 100 to 200 cm.
2. Mean annual temperature of about 27°C.
3. The average annual relative humidity of 60 to 75 per cent.
4. Spring and summer are dry.
Select the correct option from the codes given below:
  • (A) Only 1, 2 & 3
  • (B) Only 2, 3 & 4
  • (C) Only 1, 3 & 4
  • (D) 1, 2, 3 & 4
Studies had revealed that human population growth curve is
  • (A) S-shaped
  • (B) F-shaped
  • (C) J-shaped
  • (D) U-shaped

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