Which one of the following pairs does not have the same dimension?

• Potential energy and kinetic energy

• Density and specific gravity

• Focal length and height

• Gravitational force and frictional force

Which one of the following graphs represents uniform motion?

How many sixty watts (60 W) bulbs may be safely used in a 240-V supply with a 4-ampere fuse?

• 4

• 8

• 12

• 16

A vessel contains oil (density ρ₁) over a liquid of density ρ₃; a homogeneous sphere of volume V floats with half of its volume immersed in the liquid and the other half in oil. The weight of the sphere is

• V (ρ₂ - ρ₁) / 2

• V (ρ₂ + ρ₁) g/ 2

• V (ρ₂ - ρ₁) / 2

• V (ρ₂ - ρ₁) / 2

For a simple pendulum is simple harmonic motion, which of the following statements is/are correct?

1. The kinetic energy is maximum at the mean position.
2. The potential energy is maximum at the mean position.
3. Acceleration is maximum at the mean position.

Select the correct answer using the code given below:

• 1 only

• 2 only

• 1 and 3

• 2 and 3

'Pitch' is a characteristic of sound that depends upon its

• intensity

• frequency

• quality

• None of these

The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for

• a microscope

• a telescope

• both microscope and telescope

• neither microscope nor telescope

The effective resistance of three equal resistances, each of resistance r, connected in parallel, is

• 3/r

• r/3

• 3r

• r³

319.

Which one of the following pairs of rays is electromagnetic in nature?

• Beta rays and gamma rays

• Cathode rays and X-rays

• Alpha rays and X-rays

• X-rays and gamma rays.

The magnetic lines of force due to a bar magnet

• intersect inside the body of the magnet.

• intersect at neutral points only.

• intersect only at north and south poles.

• cannot intersect at all.