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Q:

At what angle the hands of a clock are inclined at 15 minutes past 5?

A) 57.5 degrees	B) 67.5 degrees
C) 77.5 degrees	D) 87.5 degrees

Answer & Explanation Answer: B) 67.5 degrees

Explanation:

Angle traced by hour hand in $\frac{21}{4}$ 21 hrs = ${(\frac{360}{12} \times \frac{21}{4})}^{0}$ = $157 \frac{1^{0}}{2}$

Angle traced by min. hand in 15 min = ${(\frac{360}{12} \times 15)}^{0}$ = $90^{0}$

$\therefore$ Required Angle = ${(157 \frac{1}{2})}^{0} - 90^{0}$ = $67 \frac{1^{0}}{2}$

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

Q:

The angle between the minute hand and the hour hand of a clock when the time is 4.20, is:

A) 0	B) 10
C) 30	D) 60

Answer & Explanation Answer: B) 10

Explanation:

Angle traced by hour hand in $\frac{13}{3}$ hrs = ${(\frac{360}{12} \times \frac{13}{3})}^{0}$ = $130^{0}$

Angle traced by min. hand in 20 min = ${(\frac{360}{60} \times 20)}^{0}$ = $120^{0}$

Required angle = (130 - 120)º = 10º

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

Q:

In nuclear reactor the speed of neutrons is slowed down by

A) heavy water	B) ordinary water
C) Zinc rods	D) molten caustic soda

Answer & Explanation Answer: A) heavy water

Explanation:

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Filed Under: Chemistry

Q:

Hydrogen bomb is based on the principle of

A) nuclear fission	B) nuclear fusion
C) natural radioactivity	D) artificial radioactivity

Answer & Explanation Answer: B) nuclear fusion

Explanation:

Hydrogen Bomb is based on the principle of Nuclear Fusion.

Hydrogen_bomb_is_based_on_the_principle_of1552385714.jpg image

Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.

The difference in mass between the reactants and products is manifested as either the release or absorption of energy.

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

Q:

When the nucleus of Uranium is bombarded with neutrons, it breaks up into two nuclei of nearly equal mass. this process is called

A) nuclear fission	B) nuclear fusion
C) physical change	D) artificial radioactivity

Answer & Explanation Answer: A) nuclear fission

Explanation:

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Filed Under: Chemistry

Q:

The first indication that a stable nucleus can be broken down was afforded by

A) Rutherford	B) Madam Curie
C) Soddy	D) Schmidt

Answer & Explanation Answer: A) Rutherford

Explanation:

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Q:

Who present the theory of radioactive disintegration

A) Rutherford and Soddy	B) Soddy and Fajan
C) Thomson and Rutherford	D) Hahn and strassman

Answer & Explanation Answer: A) Rutherford and Soddy

Explanation:

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Filed Under: Chemistry

Q:

Which of the following does not contain the material particles

A) alpha - rays	B) beta - rays
C) gamma - rays	D) anode rays

Answer & Explanation Answer: C) gamma - rays

Explanation:

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Filed Under: Chemistry

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