Basic Science Practice Question and Answer
8 Q: Octopus belongs to the phylum
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5f436ad397c6dd29b38ec477- 1Echinodermatafalse
- 2Nideriafalse
- 3Molluscatrue
- 4Chordatafalse
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Answer : 3. "Mollusca "
Q: What is the scientific name for common salt?
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5fc9d524b3b23538af75d913- 1sodium sulfatefalse
- 2sodium chloridefalse
- 3sodium bicarbonatefalse
- 4Ammonium chloridetrue
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Answer : 4. "Ammonium chloride"
Q: Whose register is the montrix record?
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5f60427d2eed863f3a805bfb- 1Dangerous foreign speciesfalse
- 2endangered wild speciesfalse
- 3Aquatic places at risk under anthropogenic activitiestrue
- 4None of thesefalse
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Answer : 3. "Aquatic places at risk under anthropogenic activities"
Explanation :
The Montreux Record is a register of wetland sites on the List of Wetlands of International Importance where changes in ecological character have occurred, are occurring, or are likely to occur as a result of technological developments, pollution or other human interference. It is maintained as part of the Ramsar List.
Q: Which one of the following organisms has a role in converting nitrates to free nitrogen?
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5ef585b0f2ebd073795f236b- 1Pseudomonasfalse
- 2Nitrosomonasfalse
- 3Nitrobacterfalse
- 4Rhizobiumtrue
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Answer : 4. "Rhizobium"
Explanation :
Nitrates are reduced back into nitrogen in the soil by a process called denitrification. This process is performed by bacteria like Pseudomonas denitrificans, etc.
Q: Why it is not advisable to sleep under a tree at night?
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5ef432e8d40ebf3f78335a80- 1Release of less oxygenfalse
- 2Release of more oxygenfalse
- 3Release of carbon dioxidetrue
- 4Release of carbon monoxidefalse
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Answer : 3. "Release of carbon dioxide"
Explanation :
Sleeping under a tree is not advisable at night, since photosynthesis does not occur, oxygen is not being produced by the trees. In addition to this, the trees continue respiring thereby causing the amount of carbon dioxide to be increased and the amount of oxygen to be reduced.
Q: The sweet taste of fruits is due to-
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5f61cd4c8561dc09cc7809ba- 1Ribosefalse
- 2Lactosefalse
- 3Fructosetrue
- 4Maltosefalse
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Answer : 3. "Fructose"
Q: Which rays are the latest research for use in medicine and war?
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5f912ebed6785c0fc0d910b0- 1X raysfalse
- 2Laser raystrue
- 3Gamma raysfalse
- 4cathode raysfalse
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Answer : 2. "Laser rays"
Q: Which of the following hitting methods has the highest power factor?
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5ef417b67c1ec61320b5a6c6- 1heating resistancetrue
- 2induction heatingfalse
- 3Arc heatingfalse
- 4Dielectric heatingfalse
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Answer : 1. "heating resistance"
Explanation :
The correct answer is Resistance Heating. Resistance heating is based on the I2R effect and is highly resistive in nature that's why it has the maximum power factor. Electric resistance heating is defined as “the heat produced by passing an electric current through a material that preferably has high resistance”.

