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

S₁:This weather-vane often tops a church spire, tower or high building.
P :They are only wind-vanes.
Q :Neither alone can tell us what the weather will be.
R :They are designed to point to direction from which the wind is coming.
S :Just as the barometer only tells us the pressure of air, the weather-vane tells us the direction of wind.
S₆:The weather-vane can, however give us some indication of other.

The Proper sequence should be:

A

PQRS

B

PSRQ

C

PRSQ

D

SPQR

The force exerted by a jet of water in the direction of jet of jet on moving curved plates is ___________

A

pa(v-u)*(v-u)

B

pa(v-u)

C

pav*(v-u)(1+cos k)

D

pa(v-u)*(v-u)(1+sin k)

True breeding Drosophila flies with curved wings and dark bodies were mated with true breeding short wings and tan body Drosophila, The F₁ progeny was observed to be with curved wings and tan body. The F₁ progeny was again allowed to breed and produced flies of the following phenotype, 45 curved wings tan body, 15 short wings tan body, 16 curved wings dark body and, 6 short wings dark body. The mode of inheritance is

A

Typical Mendelian with curved wings and tan body being dominant

B

Typical non-Mendelian with curved wings and tan body not following any pattern

C

Mendelian with suppression of phenotypes

D

Mendelian with single crossover

The force exerted by a jet of water in the direction of jet of jet on a stationary curved plates Fx is ____________

A

pav*v

B

pav

C

pav*v(1+cos k)

D

pav*v(1+sin k)

Velocity of a man is 25 units in the positive X direction and 75 units in negative Y direction starting from the origin. Velocity of a woman is 25 units in the positive Y direction and 75 units in the negative X direction starting from the origin. What is the relative velocity of the man with respect to the woman?

A

100î – 100ĵ

B

100î + 100ĵ

C

-100î – 100ĵ

D

0î + 0ĵ

Velocity of a dog is 15 units in the positive X direction and 3 units in positive Y direction starting from the origin. Velocity of a pig is 7 units in the positive Y direction and 17 units in the positive X direction starting from the origin. What is the relative velocity of the dog with respect to the pig?

A

-2î – 4ĵ

B

-3î – 2ĵ

C

-4î – 2ĵ

D

7î + 4ĵ

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

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

Which is a handheld device of the Stone Age that was made by striking off a large flake of stone or by striking off small flakes from a stone core to produce a desired shape?

A

errailure

B

flake tool

C

flute

D

ventifact

A rod 5 m in length is moving in a vertical plane. When it is inclined at 60° to horizontal, its lower end is moving horizontally at 3 m/sec and upper end is moving in vertical direction. The velocity of its upper end, is

A

0.5 m/sec

B

1.0 m/sec

C

1.5 m/sec

D

2.5 m/sec

The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m³, a = Cross-sectional area of jet in m² and V = Velocity of jet in m/s)

A

$$\frac{{{\text{waV}}}}{{2{\text{g}}}}$$

B

$$\frac{{{\text{waV}}}}{{\text{g}}}$$

C

$$\frac{{{\text{wa}}{{\text{V}}^2}}}{{2{\text{g}}}}$$

D

$$\frac{{{\text{wa}}{{\text{V}}^2}}}{{\text{g}}}$$

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

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