Question Library — KalmiPrep by Kalmitech

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

a machine is said to be a third class lever when the

A

load is between the fulcrum and effort

B

fulcrum is between the effort and the load

C

effort is between the fulcrum and load

D

fulcrum is directly below the load

medium Difficulty

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

In order to prevent bar magnets from losing their strength, they are stored wih keepers such that the two bars are placed with

A

like poles facing each other and the keepers placed between them

B

like poles facing each other and the keepers placed between them

C

unlike poles facing each other and the keepers placed at their ends

D

unlike poles facing each other and the keepers placed between them

medium Difficulty

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

Determine the potential difference. V across the parallel resistors

Attached Figure / Diagram

A

2.0V

B

2.3V

C

3.0V

D

0.7V

medium Difficulty

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

In the wiring of houses, the fuse is connected to the wire coloured

A

blue

B

brown

C

yellow

D

yellow and green

medium Difficulty

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

Which of the following factors will increase the sensitivity of moving coil meter?

A

strong spring

B

low numbers of turns

C

small area of coil

D

soft iron core

medium Difficulty

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

Capacitors are used in the following devices, except

A

water pumping machines

B

ceiling fans

C

electric irons

D

television sets

medium Difficulty

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

In a cathode ray tube, the function of the x-plates is to

A

deflect the electron beam horizontally

B

deflect the electron beam vertically

C

reflect the electron beam

D

generate sinusoid waves

medium Difficulty

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

A nuclide represented as \(^{70}_{32}X\) has a neutron-proton ratio of

A

0.5

B

0.8

C

1.2

D

1.5

medium Difficulty

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

Neutrons are used to induce artificial radioactivity because they

A

are energetic

B

have no charge

C

have no mass

D

are ionizing

medium Difficulty

Physics WAEC / WASSCE 2010 Heat Energy & Temperature

You are provided with a voltmeter V, a chemical cell/ battery E; two standard resistors R, and R a potentiometer a key K a jockey, and other necessary materials. Set up a circuit as shown in the diagram above. Close the key K. Make contact with the potentiometer wire AB using the jockey at a point C such that AC = x = 20cm Read and record the voltmeter reading Evaluate x\(^{-1}\) and v\(^{-1}\) Repeat the procedure for other values of x= 30, 40, 50, 60 and 80cm. Tabulate your readings. Plot a graph with V\(^{-1}\) on the vertical axis and x\(^{-1}\) on the horizontal axis, starting both axes from the origin (0, 0). Determine the: (a) slope, s, of the graph; (b) intercept, c, on the vertical axis. State two precautions taken to ensure accurate results. (b)i. State the two devices in which ohm's law does not apply. ii. A current of 1 A is supplied to two resistors of resistance 2\(\Omega\) and 3\(\Omega\) connected in parallel. Calculate the current in each resistor.

A

are energetic

B

have no charge

C

have no mass

D

are ionizing

medium Difficulty

Physics UTME / JAMB 2009 Heat Energy & Temperature

The thermometer whose reading is indicated by a change in color of its thermometric property is the?

A

bi-metalic strip thermometer

B

thermocouple

C

platinium resistance thermometer

D

optical pyrometer

medium Difficulty

Physics UTME / JAMB 2009 Heat Energy & Temperature

A heating coil rated 1000 W is used to boil off completely 2 kg of boiling water. The time required to boil the water is? [Special latent heat of Vaporization of water = 2.3 x 10\(^6\) Jkg-1]

A

1.15 x 104s

B

1.15 x 103s

C

4.6 x 104s

D

4.6 x 103s

medium Difficulty

Physics UTME / JAMB 2009 Heat Energy & Temperature

A man standing 2 m from a charcoal fire is warmed mainly by?

A

convection

B

radiation

C

refraction

D

conduction

medium Difficulty

Physics UTME / JAMB 2009 Heat Energy & Temperature

I. Diameter of a small ball bearing. II. Thickness of a pieces of paper. III. Diameter of a measuring cylinder. IV. Length of a piece of wire. Which of the above can be measured using a micrometer screw gauge?

A

I, II and IV only .

B

I and II only

C

II and III only

D

III and IV only

medium Difficulty

Physics UTME / JAMB 2009 Heat Energy & Temperature

Which of the following is a secondary colour

A

blue

B

orange

C

red

D

green

medium Difficulty