The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the

একটি পানিপূর্ণ কুয়ার গভীরতা 20m ও ব্যাস 2 m. কুয়াটিকে পানি শূণ্য করার জন্য 5 HP এর একটি পাম্প লাগানো হল। অর্ধেক পানি তোলার পর পাম্পটি নষ্ট হয়ে গেল। বাকি পানি তোলার জন্য একই ক্ষমতা সম্পন্ন আর একটি পাম্প লাগানো হল। প্রথম পাম্প দ্বারা সম্পাদিত কাজের পরিমান নির্ণয় কর।(The depth and diameter of a water filled well are 20 m and 2 m respectively. An engine of 5 HP is attached to pump out the water. The pump was ruined after emptying half of the water. Then another pump of same capacity was attached to pump out rest of the water. Determine the work done by first pump.)

A

2.54 × 104 J

B

1.44 × 104 J

C

2.34×104 J

D

1.54 × 104 J

E

1.54 ×104 J

A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump

A

Develops a lower head

B

Capacity is reduced

C

Requires more power

D

All of the above

Working alone, pump A can empty a pool in 3 hours. Working alone, pump B can empty the same pool in 2 hours. Working together, how many minutes will it take pump A and pump B to empty the pool?

A

72

B

75

C

84

D

96

When the water is warm, the height to which it can be lifted by a pump

A

Decreases due to reduced viscosity

B

Decreases due to reduced vapour pressure

C

Increases due to increased vapour pressure

D

Decreases due to increased frictional resistance

A boat has a crack in its bull which is leaking water into the boat and could pump which can pump the water out in 8 hours . If the boat is 168 km away from the shore and the pump is running what is the minimum speed the boat should run at so that it can reach the shore before sinking?

A

5km./hour

B

6 km/hour

C

7 km/hour

D

8km/hour

A,B,C,D,E,G and I are seven friends who study in three different standards namely 5th, 6th and 7th such that not less than two friends study in the same standard. Each friend also has a different favorite subject namely History, Civics, English, Bangla, Science , Maths , and Economics but not necessarily in the same order. A likes Maths and studies in the 5th standard with only one other friend who likes Bangla. I studies with tow other friends . Both the friends who study with I like languages (Here languages include only Science , English and Bangla ) . D studies in the 6th standard with only one person and does not like Civics . E studies with only one friend . The one who likes history does not study in 5th or 6th standard . E does not like languages. C does not like English , Science or Civics. Which combination represents E's favorite subject and the standard in which he studies?

A

Civics and 7th

B

Economics and 5th

C

Civics and 6th

D

History and 7th

110m গভীর একটি কুয়া থেকে ইঞ্জিনের সাহায্যে প্রতি মিনিটে 1200 kg পানি উঠানো হয়। যদি ঐ পানি উঠাতে ইঞ্জিনটির ক্ষমতা 40% কমে যায়, তাহলে এর অশ্বক্ষমতা কত?(1200 kg water is lifted per minute from a 110 m deep well with the help of an engine. If the engine loses 40% of its power to lift the water, what is its power in HP?)

A

37.75 HP

B

38 HP

C

48.17 HP

D

49 HP

E

50.2 HP

If Michael can shovel all the snow of a standard driveway in 12 minutes, and Emon can shovel all the snow of a standard driveway in 36 minutes, then working together, how many minutes would it take for them both to shovel all the snow of a standard driveway?

A

5

B

9

C

15

D

18

Boiler feed water pump is usually a __________ pump.

A

Reciprocating

B

Gear

C

Multistage centrifugal

D

Diaphragm

Centrifugal pump can't be used to pump

A

Molten sodium (used as a coolant in Fast Breeder Reactor)

B

Moderately viscous vegetable oil used in soap industry

C

Thick molten soap at 80°C

D

None of the above

The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the

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