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Q:

' Yellow cake ' an item of smuggling across border s

A) A crude form of heroin	B) A crude form of cocaine
C) Uranium oxide	D) Unrefined gold

Answer & Explanation Answer: C) Uranium oxide

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:

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

Explanation:

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Filed Under: Chemistry

Q:

In atomic reactors,graphite is used as

A) lubricant	B) fuel
C) linear of the ractor	D) moderator

Answer & Explanation Answer: D) moderator

Explanation:

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Filed Under: Chemistry

Q:

Energy produced in nuclear reaction is given by

A) Charle's law	B) Grahm's law
C) Gay - Lussac's law	D) Einstein's law

Answer & Explanation Answer: D) Einstein's law

Explanation:

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Filed Under: Chemistry

Q:

Find the angle between the hour hand and the minute hand of a clock when the time is 3.25

A) 47.5 degrees	B) 57.5 degrees
C) 45.5 degrees	D) 55.5 degrees

Answer & Explanation Answer: A) 47.5 degrees

Explanation:

At 3 O'clock, Minute hand is at 12 while the Hour hand is at 3. Again the minute hand has to sweep through ( 30 x 5 ) ie 150° for reaching the figure 5 to show 25 mins.

Simultaneously the Hour hand will also rotate for 25 mins. Thus starting from the mark, 3 the hour hand will cover an angle = (25 x 30) / 60 = 12.5°

Hence, Angle between Hour and the Minute hand = ( 60 - 12.5 ) = 47.5°

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

Q:

How many times in a day, are the hands of a clock in straight line but opposite in direction?

A) 11	B) 22
C) 33	D) 44

Answer & Explanation Answer: B) 22

Explanation:

The hands of a clock point in opposite directions (in the same straight line) 11 times in every
12 hours. (Because between 5 and 7 they point in opposite directions at 6 o'clcok only).
So, in a day, the hands point in the opposite directions 22 times

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

Q:

At 3.40, the hour hand and the minute hand of a clock form an angle of:

A) 110	B) 120
C) 130	D) 140

Answer & Explanation Answer: C) 130

Explanation:

Angle traced by hour hand in 12 hrs. = 360º.

Angle traced by it in $\frac{11}{3}$ hrs = ${(\frac{360}{12} \times \frac{11}{3})}^{0}$ = $110^{0}$

Angle traced by minute hand in 60 min. = $360^{0}$

Angle traced by it in 40 min = ${(\frac{360}{60} \times 40)}^{0}$ = $240^{0}$

$\therefore$ Required angle (240 - 110)º = $130^{0}$

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

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