Question # 1

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

Two electric bulbs of 200 W and 100 W have same voltage.If R1 and R2 be their resistance respectively then

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R₁ = 2R₂

R₂ = 2R₁

R₂ = 4R₁

R₁ = 4R₂

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

A person standing on a rotating platform has his hands lowered He suddenly outstretches his arms.The angular momentum

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Becomes zero

Increases

Decreases

Remains the same

The fundamental unit which has same power in the dimensional formula of surface tension and viscosity is:

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Mass

Length

Time

None

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much estimate of the kinetic energy obtained by measuring mass and speed

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11%

8%

5%

1%

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

The modulus of rigidity of a liquid is

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Zero

1

Infinity

A value not one of those mentioned above

A conducting wire is drawn to double its length Final resistivity of the material will be

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Double of the original one

Half of the original one

One-fourth of the original one

Same as original one

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