PHYSICS ACHIEVEMENT TEST

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INSTRUCTIONS: ANSWER ALL THE QUESTIONS
TIME: 30 MINUTES

GENDER

Two tuning forks of frequencies 256Hz and 260Hz sounded close to each other. What is the frequency of the beats produced?

5 points

2Hz

4Hz

8Hz

258Hz

Clear selection

The velocity of sound in air will be doubled if its absolute temperature is?

5 points

Doubled

Halved

Constant

Quadrupled

Clear selection

When left in a freezer, a bottle full of water cracks on freezing into ice because of the?

5 points

Increase in the volume of water

Contraction of the bottle

Expansion of the bottle

Decrease in the volume of water

Clear selection

How many grams of water at 17°c must be added to 42g of ice at 0°c to melt the ice completely? (specific latent heat of fusion of ice=340*10³J/kg, specific heat capacity of water=4200J/kg/k)

5 points

200g

300g

320g

400g

Clear selection

200g of water at 90°c is mixed with 100g of water at 30°c. What is the final temperature?

5 points

50°c

60°c

70°c

80°c

Clear selection

Thermal equilibrium between two objects exists when?

5 points

The heat capacities of both objects are the same

One object loses heat continuously to the other

The temperature of both objects are equal

The quality of heat in both objects is the same

Clear selection

The expansion of solids can be considered a disadvantage in the?

5 points

Balance wheel of the watch

Fitting of wheel on rims

Fire alarms

Thermostat

Clear selection

In what range of temperature is the expansion of water anomalous?

5 points

+208°c to 212°c

-80°c to -76°c

-4°c to 0°c

0°c to 4°c

Clear selection

The velocity ratio is 5 and it's efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?

5 points

50N

40N

30N

20N

Clear selection

Given three capacitors 0.3µF, 0.5µF, 0.2µF, the joint capacitance when arranged to give minimum capacitance is?

5 points

0.1µF

0.3µF

1.0µF

0.5µF

Clear selection

A point at which the molecules of a loaded wire begin to slide across each other resulting in a rapid increase in extension is the?

5 points

Yield point

Elastic point

Deformation point

Proportional point

Clear selection

The property of a material that allows it to be stretched into a wire is called?

5 points

Brittleness

Malleability

Fragility

Ductility

Clear selection

The energy contained in a wire when it is extended by 0.02m by a force of 500N is?

5 points

10J

1000J

10000J

Clear selection

The correct unit of density is?

5 points

kg/m/s²

kg/m³/s²

kgm²/s²

kgm³/s²

Clear selection

A rectangular tank contains water to a depth of 2m. If the area is 4m*3m, calculate the force on the base (density of water=1000kg/m³)

5 points

2.4*10^5N

2.4*10^4N

2.0*10^4N

1.7*10³N

Clear selection

Which of the following is NOT a fundamental S. I. unit?

5 points

Meter

Ampere

Kelvin

Radian

Clear selection

At what respective values of x, y and z would the unit of force, the newton, be dimensionally equivalent to M^xL^yT^z?

5 points

-1,1,2

1,1,-2

-1,1,-2

1,-1,2

Clear selection

Which of the following is a fundamental unit?

5 points

Newton

Watt

Joule

Second

Clear selection

Which of the following obeys Ohm's law?

5 points

Glass

Diode

All electrolytes

All metals

Clear selection

An equipment whose power is 1500W and resistance is 375ohms would draw a current of

5 points

0.10A

2.00A

4.00A

77.5A

Clear selection

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