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Q:

Which one is not the isotopes of hydrogen

A) Protium	B) Deuter
C) Tritium	D) All

Answer & Explanation Answer: C) Tritium

Explanation:

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Filed Under: Chemistry

Q:

Which one of the following elements is essential for construction is nuclear reactors

A) Cobalt	B) Nickel
C) Zirconium	D) Tungsten

Answer & Explanation Answer: C) Zirconium

Explanation:

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Filed Under: Chemistry

Q:

Which one of the following is not radioactive

A) Astanine	B) Francium
C) Tritium	D) Zirconium

Answer & Explanation Answer: D) Zirconium

Explanation:

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Filed Under: Chemistry

Q:

Which one of the following can be used to confirm wether drinking water contains a gamma emitting isotope or not

A) Microscope	B) Scintillation counter
C) Lead plate	D) pectrophotometer

Answer & Explanation Answer: B) Scintillation counter

Explanation:

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Filed Under: Chemistry

Q:

Which of the following is a radioactive element

A) Sulphur	B) Polonium
C) Tellurium	D) Selenium

Answer & Explanation Answer: B) Polonium

Explanation:

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Filed Under: Chemistry

Q:

In nuclear reactor,Chain reaction is controlled by introducing

A) cadmium rod	B) iron rod
C) platinum rod	D) graphite rod

Answer & Explanation Answer: A) cadmium rod

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Filed Under: Chemistry

Q:

At what time between 9 and 10 o'clock will the hands of a watch be together?

A) (49 + 3/11) min past 11	B) (49 +1/11) min past 9
C) (45 +1/11) min past 9	D) (45 +7/11) min past 11

Answer & Explanation Answer: B) (49 +1/11) min past 9

Explanation:

To be together between 9 and 10 o'clock, the minute hand has to gain 45 min. spaces.
55 min. spaces gained in 60 min.

45 min. spaces are gained in $\frac{60}{55} \times 45$ min or $49 \frac{1}{11}$ min

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Filed Under: Clocks
Exam Prep: Bank Exams
Job Role: Bank PO

Q:

At what time between 4 and 5 o'clock will the hands of a watch point in opposite directions?

A) 54 past 4	B) (53 + 7/11) past 4
C) (54 + 8/11) past 4	D) (54 + 6/11) past 4

Answer & Explanation Answer: D) (54 + 6/11) past 4

Explanation:

4 o'clock, the hands of the watch are 20 min. spaces apart.
To be in opposite directions, they must be 30 min. spaces apart.
Minute hand will have to gain 50 min. spaces.
55 min. spaces are gained in 60 min

50 min. spaces are gained in $\frac{60}{55} \times 50$ min. or $54 \frac{6}{11}$

Required time = $54 \frac{6}{11}$ min. past 4.

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Filed Under: Clocks
Exam Prep: AIEEE , Bank Exams
Job Role: Analyst , Bank Clerk , Bank PO

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