Form Four - Miscellaneous Quiz 3

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🕰️ Duration: 15 minutes

❓ Number of Questions: 2

⏰ Time Remaining: 15:00

⌛ Progress: 0 / 2

In the figure, what is its zero error?

A. 0.3mm B. 0.7mm C. -0.3mm D. -0.7mm E. 0.0cm

Figure show a uniform beam balanced by two weights X and Y.

If a weight 2X is now added to X, the rod will be balanced again by;

A. Moving Y near to G B. Adding a weight 2X to Y C. Moving the weights 2X and X further away from G D. Adding a weight 2Y to Y E. Adding a weight of Y to Y

When a beam of alpha particles is fired at a thin gold film, some of the particles were considerably deflected. This experiment shows that;

A. Alpha particles are very light B. A gold nucleus contains alpha particles C. Electrons in the gold nucleus attract alpha particles D. A gold nucleus is concentrated in a small volume E. A gold nucleus emits alpha particles

In an iron-cored transformer, the number of secondary turns is 100 and of primary turns is 2000. When 240v a.c. is connected from the mains, the output is;

A. 240v B. 12v C. 100v D. 20v E. 4800v

Which of the following is necessary for total internal reflection to occur at an air glass boundary?

A. Light must travel from air to glass B. The angle of incidence in glass must be less than the critical angle C. Light must travel from glass to air D. The angle of incidence in glass must be greater than the critical angle E. The angle of incidence in air must be greater than the critical angle

Figure 3 show s the block being pulled along a track. If a force of 20N is applied in a direction A at an angle of 60°, what value of force will pull the block along the direction B?

A. 17N B. 20N C. 12N D. 10N E. 5N

Suppose the fundamental frequency of vibration of a stretched string is F. what will be the fundamental frequency if the length of the string is halved and the tension is increased four times?

A. 4F B. 2F C. F D. 3F E. 5F

What will happen if a soft iron core of an electric bell is replaced by a steel iron as a core?

A. A bell continuous ringing B. A bell stop ringing and will never ring again C. A bell will ring only once D. A bell will ring three times E. A bell will ring two times

One of the following statements is not true about X-rays.

A. They travel in a straight line at the velocity of light B. They cannot be deflected by electric and magnetic field C. They do not cause ionization of gases D. They affect photographic film E. They can produce fluorescence

A figure, shows a certain type of rectification.

A. Full-wave rectification B. Half-wave rectification C. Centre-tape full-wave rectification D. Smoothened half-wave rectification E. Smoothened full-wave rectification