Form 4: Pre-final 1

Why the wall of the dam has to be thicker at bottom?

• To lower the centre of gravity of the dam.
• To sustain the greater pressure of the water
• To increase the surface area exerted by atmospheric pressure
• To decrease the speed of water flow down if the water volume excess the capacity of the dam

The physical principle used by a hydraulic system is

• Archimedes' principle
• Pascal's principle
• Bernoulli's principle
• Charles' law

A plane mirror has the following characteristics of image except

• virtual
• upright
• diminished
• laterally inverted

An object is located at focal point, f of a convex lens. What is the characteristic of the image formed?

• Real, inverted, diminished
• real, upright, magnified
• virtual, inverted, diminished
• virtual, upright, magnified

A boy is stands 3.0 m in front of a plane mirror. What is the distance between the boy and his image in the mirror?

• 1.5 m
• 3.0 m
• 4.5 m
• 6.0 m

A concave mirror has a focal length of 10 cm. Which of the following object distances can produce an image that is real, inverted, and magnified?

• 5 cm
• 10 cm
• 15 cm
• 20 cm

An object is placed at 20 cm from a concave lens with focal length of 15 cm. A virtual image is produced. What is the linear magnification of the image?

• 0.43
• o.57
• 2.33
• 3.00

What is the image which is produced by a converging lens on a screen?

• real and inverted
• real and upright
• virtual and inverted
• virtual and upright

What is the concept used in optical fibre?

• Refraction
• Diffraction
• Interference
• Total internal reflection

Which of the following characteristics can be used to differentiate between a longitudinal wave and a transverse wave?

• The wavelength of the waves
• The amplitude of the waves
• The medium required for propagation of the waves
• The direction of moving particles to the direction of the propagation of the waves