When a steel ball is placed on the surface of mercury, it does not sink because

Capillary rise of mercury in a small diameter tube is proportional of (where, d = mercury of the rube, σ = surface tension of mercury)

A

d

B

1/d

C

σ

D

1/σ

A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because

A

The batsman did not hit the ball hard enough

B

Velocity is proportional to the force exerted on the ball

C

There is a force on the ball opposing the motion

D

There is no unbalanced force on the ball, so the ball would try to come to rest

Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)

A

d

B

$$\frac{1}{{\text{d}}}$$

C

$$\sigma $$

D

$$\frac{l}{\sigma }$$

A ball and a bat costs 110 taka. The bat costs 100 taka more than the ball. How much does the ball cost ?

A

5

B

10

C

15

D

100

A sink contains exactly 12 liters of water. If water is drained from the sink until it holds exactly 6 liters of water less than the quantity of water drained away, how many liters of water were drained away ?

A

2

B

3

C

9

D

6

এ সমস্যা থেকে মুক্তির উপায় হলো—i. CPU ঠাণ্ডা করাii. heat sink পরিষ্কার করাiii. heat sink এর সাথে র্যাম যুক্ত করানিচের কোনটি সঠিক?

A

i ও ii

B

i ও iii

C

ii ও iii

D

i, ii ও iii

A spherical ball made of steel when dropped in mercury container

A

Sink in mercury

B

Will be on the surface of mercury

C

Will be partly immersed mercury

D

Will dissolve in mercury

A box contains 21 balls numbered 1 to 21 . A ball numbered 1 to 21 . A ball is drawn and then another ball is brawn without replacement . What is the probability that both balls are even numbered?

A

2/7

B

3/14

C

8/21

D

5/21

A bag contains 7 red, 9 yellow and 3 black balls. If a ball is picked at random, what is the probability that the ball drawn will be either a red of a black ball.

A

7/19

B

9/19

C

10/19

D

11/19

A sport goods store ordered an equal number of white and yellow tennis balls. The tennis ball company delivered 30 extra tennis ball, making the ratio of white balls to yellow balls 6:5, How many tennis ball did the sport goods store originally order?

A

150

B

180

C

300

D

330

When a steel ball is placed on the surface of mercury, it does not sink because

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