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Q:

Give the common name for the following compound

${({CH}_{3})}_{2} CH {CH}_{2} - Br$

A) Isobutyl bromide	B) Methyl bromide
C) Propyl bromide	D) Butyl bromide

Answer & Explanation Answer: A) Isobutyl bromide

Explanation:

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Q:

Oar is to rowboat as foot is to

A) Walk	B) Loafers
C) Skateboard	D) Running

Answer & Explanation Answer: C) Skateboard

Explanation:

A rowboat can be put into motion by using oar. Similaarly, a skateboard can be put into motion by using foot.

The other options like walk and running are not objects to be in motion. And loafers are something worn on foot.

Hence, Oar : Rowboat :: Foot : Skateboard.

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Q:

Rajesh rows in still water with a speed of 4.5 kmph to go to a certain place and comes back. Find his average speed for the whole journey, if the river is flowing with a speed of 1.5 kmph?

A) 2 kmph	B) 4 kmph
C) 6 kmph	D) 8 kmph

Answer & Explanation Answer: B) 4 kmph

Explanation:

Let the distance in one direction = k kms

Speed in still water = 4.5 kmph

Speed of river = 1.5

Hence, speed in upstream = 4.5 - 1.5 = 3 kmph

Speed in downstream = 4.5 + 1.5 = 6 kmph

Time taken by Rajesh to row upwards = k/3 hrs

Time taken by Rajesh to row downwards = k/6 hrs

Now, required Average speed = $\frac{Total distance}{Total speed} = \frac{2 k}{\frac{k}{3} + \frac{k}{6}} = \frac{2 k x 18}{6 k + 3 k} = 4 kmph$

Therefore, the average speed of the whole journey = 4kmph.

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Filed Under: Boats and Streams
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Q:

Which of the following foods does not support bacterial growth?

A) Raw carrots	B) Sauted onions
C) Refried beans	D) Cooked rice

Answer & Explanation Answer: A) Raw carrots

Explanation:

Cooked food create an enabling environment for bacteria to grow because of their moisture content & of the normal temperature of the food.

raw_food_vs_cooked_food1591419246.png image

Raw food does not offer suitable conditions for bacteria growth.

Hence, from the given options raw carrots does not support bacterial growth.

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Filed Under: General Science
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Q:

Name the player who became the first Indian javelin thrower to claim a gold medal at the Commonwealth Games 2018.

A) Neeraj Chopra	B) Ankur Mittal
C) Seema Antil	D) Annu Rani

Answer & Explanation Answer: A) Neeraj Chopra

Explanation:

Neeraj Chopra became the first Indian javelin thrower to claim a gold medal at the Commonwealth Games, with a season’s best effort of 86.47m in the final. The 20-year-old junior world champion had made the final after achieving the qualifying mark in his very first throw.

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Filed Under: Sports
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Q:

Microwave communication uses high-frequency.

A) TRUE

B) FALSE

Answer & Explanation Answer: A) TRUE

Explanation:

Microwaves are high-frequency signals in the 300 MHz to 300 GHz range. This is in contrast to radio signals, which are typically broadcast in all directions. Radio signals operate in the 3 Hz to 300 MHz range.

Microwave signals are used for both satellite and ground-based communications.

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Subject: Physics
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Q:

What can you catch but not throw?

Answer

A cold or flu illness.

Workspace

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Subject: Logic Puzzles Exam Prep: AIEEE , Bank Exams , CAT , GATE , GRE
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Q:

A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown with the velocity of

A) 18 m/s	B) 25 m/s
C) 30 m/s	D) 36 m/s

Answer & Explanation Answer: C) 30 m/s

Explanation:

The interval between object pass the same point is 4 sec.

That means in 2 sec, object reaches the top and in next 2 sec, it again reaches the same point.

By the info given, we can find the velocity of that point by using : v=u+(-gt)

0= u - 10×2

u = 20

Then the velocity at 25m is 20m/sec.

so the initial velocity is

$- v^{2} = u^{2} + (- 2 gh) 400 = u^{2} - 2 x 10 x 25 u^{2} = 900 = > u = 30 m / s$

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Filed Under: Physics
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