The ridges of the waves are where the jet stream of waves closes to the

The troughs of the waves are where the jet stream of waves is closest to the

A

poles

B

equator

C

Prime meridian

D

None of the above

A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity

A

One-half

B

One-third

C

Two-third

D

Three-fourth

The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is

A

$$\frac{{{\text{wa}}\left( {{\text{V}} - {\text{v}}} \right)}}{{2{\text{g}}}}$$

B

$$\frac{{{\text{wa}}\left( {{\text{V}} - {\text{v}}} \right)}}{{\text{g}}}$$

C

$$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{2{\text{g}}}}$$

D

$$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{\text{g}}}$$

A boat sailing against a stream of river takes 6 hours to travel 24 kms, while sailing with the stream it takes 4 hours to travel the same distance. What is the speed of the stream?

A

1/2 km/hr

B

1 km/hr

C

2km/hr

D

1.5 km/hr

A boat goes 8 km in one hour along the stream and 2 km in one hour against the stream. The speed in km/hr of the stream is ----

A

2

B

4

C

3

D

5

A boat sailing against a stream of of river takes 6 hours to travel 24 kms, while sailing with the stream it takes 4 hours to travels the same distance. What is the speed of the stream ?

A

2.5 km / hr

B

1.5 km / hr

C

1 km / hr

D

0.5 km / hr

A boat goes 8 km in one hour along the stream and 2 km in one hour agaist the stream. The speed i km/hr of the stream is

A

2

B

4

C

3

D

5

A man takes twice as long to row a distance against the stream as to row the same distance in favor of the stream . The ratio of the speed of the boat (in still water ) and the stream is :

A

2 : 1

B

3 : 2

C

4 : 3

D

3: 1

A boat runs at 22 km per hour along the stream and 10 km per hour against the stream .Find the ratio of the speed of the boat in still water to that of the speed of the stream .

A

2 :3

B

5 : 3

C

7 : 3

D

8 : 3

The coastline formed by the submergence of mountain ridges running parallel to the coast is known as ________

A

Dalmation coast

B

Ria coast

C

Fiord coast

D

Haff coast

The ridges of the waves are where the jet stream of waves closes to the

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