Celphy Prelims

As an object on earth reaches a higher altitude which of the following changes?

• Length

• Weight

• Mass

• Density

Instrument used to measure the speed of wind among the following is

• Speedometer

• Anemometer

• Barometer

• Odometer

If the radius of earth is halved without changing mass, then the acceleration due to gravity is___ms-2

• 9.8

• 4.9

• 39.2

• 19.6

The Young’s modulus of a perfectly rigid body is

• Zero

• Finite

• Infinite

• Can't be determined

The ratio of moment of inertia of a disc of radius 5cm to the ring of same radius provided that their masses are equal is______

• 5

• 0

• 1/2

• ∞

The resultant spring constant k of two springs if spring constants k1 and k2 connected in series together is

• k1+k2

• k1.k2

• k1.k2/(k1+k2)

• (k1+k2)/k1.k2

If the mass of the bob is increased by 2 times, the time period of the

simple pendulum is_____

• Increases 2 times

• Decreases 2 times

• Remains the same

• Data insufficient

Which of the following are the variables in Heisenberg uncertainty principle?

• Wavelength and distance

• Angular momentum and frequency

• Charge , distance

• Energy , time

The second order derivative of y=(5x)² is

• 50

• 0

• 10x

• 10

Who introduced the concept of quantization of energy ___________ .