Basic Science Practice Question and Answer
8 Q: What is the smallest unit of a chemical compound?
3588 1611b650edc4e2547a1c91c34
611b650edc4e2547a1c91c34- 1Atomicfalse
- 2electronfalse
- 3Protonfalse
- 4Moleculestrue
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Answer : 4. "Molecules"
Q: What is the scientific name for common salt?
3307 05fc9d524b3b23538af75d913
5fc9d524b3b23538af75d913- 1sodium sulfatefalse
- 2sodium chloridefalse
- 3sodium bicarbonatefalse
- 4Ammonium chloridetrue
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Answer : 4. "Ammonium chloride"
Q: Whose register is the montrix record?
3274 05f60427d2eed863f3a805bfb
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?
3235 05ef585b0f2ebd073795f236b
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?
3080 05ef432e8d40ebf3f78335a80
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-
3039 05f61cd4c8561dc09cc7809ba
5f61cd4c8561dc09cc7809ba- 1Ribosefalse
- 2Lactosefalse
- 3Fructosetrue
- 4Maltosefalse
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Answer : 3. "Fructose"
Q: Which of the following hitting methods has the highest power factor?
3037 05ef417b67c1ec61320b5a6c6
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”.
Q: The best means of extinguishing petrol fires is-
2944 05fe9a22704717d1a56bf8c10
5fe9a22704717d1a56bf8c10- 1Baking Powderfalse
- 2Carbon dioxidetrue
- 3Sandfalse
- 4Waterfalse
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