Physical Sciences

A wave in which the particles of the medium vibrate at right angles to the pathalong which the wave travels through the medium, is produced by…

• a bat.

• a car's hooter

• an ambulance

• an X-ray machine

Two identical spheres, X and Y, on insulated stands, carry charges of 3 µCand -5 µC respectively. The spheres are brought into contact with each otherand returned to their original positions. The charge on EACH sphere aftercontact is …

• 8 µC

• -4µC

• -2µC

• -1µC

How will the readings on ammeters A1, A2 and A3 compare with each other?

• A1 = A2 = A3

• A1 = A2 + A3

• (A2 + A3) ˃ A1

• A2 ˂ A3˂ A1

The SI unit for gravitational potential energy is …

• kg∙m∙s^-1

• kg∙m∙s^-2

• kg∙m^2∙s^-2

• kg∙m^-1∙s^-1

Which ONE of the following pairs of physical quantities consists of one scalar and one vector quantity?

• Distance and speed

• Speed and acceleration

• Displacement and velocity

• Velocity and acceleration

The force between two magnets decreases when…

• two like poles come closer together.

• two unlike poles come closer together.

• the distance between them increases.

• the distance between them decreases

A motorbike moving at a speed v, has a kinetic energy E. If the speed of the motorbike increases to 3v, the kinetic energy will be...

• 3E

• ⅓E

• 6E

• 9E

The energy transferred per unit electric charge in a circuit is…

• current.

• charge.

• power.

• potential difference.

The number of waves passing a point every second is defined as the … of the wave.

• speed

• amplitude

• wavelength

• frequency

A rubber balloon obtains a negative charge after it has been rubbed againsthuman hair.Which ONE of the statements below best explains why this happens?

• Negative charges are transferred from the rubber balloon to the human hair.

• Positive charges are transferred from the rubber balloon to the human hair.

• Positive charges are transferred from the human hair to the rubber balloon.

• Negative charges are transferred from the human hair to the rubber balloon.