Practice mode / Environmental Science A moderator is used in nuclear reactor in order to? A Option A: Accelerate the neutrons B Option B: Slow down the speed of the neutrons C Option C: Increase the number of elections D Option D: Decrease the number of electrons E Option E: None of these Correct answer B. Slow down the speed of the neutrons Show answer Report a problem How we write and check questions
Question 01 / Environmental Science Which of the following atmospheric layers help in radio communication? A Option A: Exosphere B Option B: Ionosphere C Option C: Troposphere D Option D: Stratosphere E Option E: Ozone layer Correct answer B. Ionosphere Show answer Open question
Question 02 / Environmental Science The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg? A Option A: 4 days B Option B: 12 days C Option C: 16 days D Option D: 8 days E Option E: None of these Correct answer D. 8 days Show answer Open question
Question 03 / Environmental Science Where do most of Asteroids lie? A Option A: In asteroid belt between the orbits of Mars and Jupiter B Option B: In asteroid belt between the orbits of Mars and Venus C Option C: In asteroid belt between the orbits of Jupiter and Venus D Option D: Everywhere in the sky E Option E: None of these Correct answer A. In asteroid belt between the orbits of Mars and Jupiter Show answer Open question
Question 04 / Environmental Science The most splendid and the most magnificent constellation on the sky is? A Option A: Orion B Option B: Columbia C Option C: Canis Major D Option D: Taurus E Option E: None of these Correct answer A. Orion Show answer Open question
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