Question
101
Biology
Which of the following best describes internal fertilization?
(A)
Fusion of gametes outside the female's body
(B)
Fusion of gametes inside the female's body
(C)
Fusion of gametes only in water
(D)
Fusion of gametes outside both parents' bodies
Correct Answer:
Fusion of gametes inside the female's body
Explanation:
In internal fertilization, the fusion of male and female gametes occurs inside the female body. Humans, most mammals, and birds are examples of organisms with internal fertilization.
In internal fertilization, the fusion of male and female gametes occurs inside the female body. Humans, most mammals, and birds are examples of organisms with internal fertilization.
Question
102
Environmental Science
Biochemical Oxygen Demand (BOD) is primarily an indicator of which of the following?
(A)
Water temperature
(B)
Organic pollution in freshwater bodies
(C)
Salinity of water
(D)
Acidity of water
Correct Answer:
Organic pollution in freshwater bodies
Explanation:
BOD indicates the amount of dissolved oxygen required by microorganisms to decompose organic matter in water. A high BOD level generally indicates a higher degree of organic pollution in a water body.
BOD indicates the amount of dissolved oxygen required by microorganisms to decompose organic matter in water. A high BOD level generally indicates a higher degree of organic pollution in a water body.
Question
103
Environmental Science
Which of the following correctly describes the role of forests in maintaining the oxygen-carbon dioxide balance in the atmosphere?
(A)
Forests absorb CO₂ and release O₂ all the time
(B)
Forests release CO₂ during the day and O₂ at night
(C)
Forests absorb CO₂ and release O₂ by photosynthesis; overall they act as carbon sinks
(D)
Forests have no major role in gas balance
Correct Answer:
Forests absorb CO₂ and release O₂ by photosynthesis; overall they act as carbon sinks
Explanation:
Forests absorb carbon dioxide from the atmosphere and release oxygen through photosynthesis. They also store large amounts of carbon in their biomass and soil, so overall they act as important carbon sinks.
Forests absorb carbon dioxide from the atmosphere and release oxygen through photosynthesis. They also store large amounts of carbon in their biomass and soil, so overall they act as important carbon sinks.
Question
104
Physics
Why does a windy day feel colder than the actual air temperature (wind chill effect)?
(A)
Wind brings colder air from distant regions
(B)
Wind increases the body's internal temperature significantly
(C)
Wind removes the warm air around the body
(D)
Wind contains tiny ice particles in large amounts
Correct Answer:
Wind removes the warm air around the body
Explanation:
Strong wind removes the layer of warm air surrounding the body and increases the rate of heat loss from the skin. Therefore, even at the same air temperature, stronger wind makes it feel colder.
Strong wind removes the layer of warm air surrounding the body and increases the rate of heat loss from the skin. Therefore, even at the same air temperature, stronger wind makes it feel colder.
Question
105
Biology
A piece of bread kept in a warm, moist place for several days develops a greenish-black, fuzzy growth on its surface. Which of the following microorganisms is most likely responsible for this?
(A)
Bacteria
(B)
Protozoa
(C)
Fungi
(D)
Algae
Correct Answer:
Fungi
Explanation:
Warm and moist conditions favor the growth of fungi. The greenish-black fuzzy growth commonly seen on bread is caused by mold fungi.
Warm and moist conditions favor the growth of fungi. The greenish-black fuzzy growth commonly seen on bread is caused by mold fungi.
Question
106
Physics
Which of the following common household appliances works primarily on the principle of the heating effect of electric current?
(A)
Electric fan
(B)
Electric iron
(C)
Washing machine
(D)
Computer
Correct Answer:
Electric iron
Explanation:
An electric iron uses a high-resistance heating element such as nichrome. When electric current passes through it, electrical energy is converted into heat energy.
An electric iron uses a high-resistance heating element such as nichrome. When electric current passes through it, electrical energy is converted into heat energy.
Question
107
Physics
Which of the following is the standard SI unit of length, recognized internationally for scientific measurements?
(A)
Foot
(B)
Inch
(C)
Meter
(D)
Yard
Correct Answer:
Meter
Explanation:
The metre is the standard SI unit of length. It is used internationally as the base unit for measuring length in scientific measurements.
The metre is the standard SI unit of length. It is used internationally as the base unit for measuring length in scientific measurements.
Question
108
Biology
When you chew a piece of bread or rice for some time, it begins to taste slightly sweet. Which component of saliva is primarily responsible for this change?
(A)
Mucus
(B)
Water
(C)
Salivary amylase (an enzyme)
(D)
Lysozyme
Correct Answer:
Salivary amylase (an enzyme)
Explanation:
The enzyme amylase present in saliva begins breaking down starch into simpler sugars, mainly maltose. This is why bread or rice starts tasting slightly sweet after being chewed for some time.
The enzyme amylase present in saliva begins breaking down starch into simpler sugars, mainly maltose. This is why bread or rice starts tasting slightly sweet after being chewed for some time.
Question
109
Chemistry
Which of the following methods is most suitable for separating rice grains from broken rice pieces when the separation is based primarily on a difference in particle size?
(A)
Filtration
(B)
Sieving
(C)
Condensation
(D)
Distillation
Correct Answer:
Sieving
Explanation:
Sieving is used to separate solid particles of different sizes. Smaller broken rice pieces pass through the sieve openings, while larger whole grains remain on the sieve.
Sieving is used to separate solid particles of different sizes. Smaller broken rice pieces pass through the sieve openings, while larger whole grains remain on the sieve.
Question
110
Chemistry
Match the following fractions obtained from the fractional distillation of petroleum with their primary uses: 1. Petrol (Gasoline), 2. Kerosene, 3. Diesel, 4. Bitumen. A. Fuel for jet aircraft, B. Fuel for road vehicles (cars, bikes), C. Fuel for heavy vehicles (trucks, buses), D. Road surfacing and waterproofing. Which of the following is the correct matching?
(A)
1-B, 2-A, 3-C, 4-D
(B)
1-A, 2-B, 3-C, 4-D
(C)
1-B, 2-C, 3-A, 4-D
(D)
1-C, 2-B, 3-A, 4-D
Correct Answer:
1-B, 2-A, 3-C, 4-D
Explanation:
Petrol is primarily used as fuel for road vehicles such as cars and bikes. Kerosene is used as aviation fuel. Diesel is used in heavy vehicles such as trucks and buses. Bitumen is used for road surfacing and waterproofing.
Petrol is primarily used as fuel for road vehicles such as cars and bikes. Kerosene is used as aviation fuel. Diesel is used in heavy vehicles such as trucks and buses. Bitumen is used for road surfacing and waterproofing.
Total Questions:
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