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90 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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90 questions

Question 1 of 20 90 total questions

Question 11

waec 2021

An electric pressing iron is connected to the mains using an insulated wire. wire becomes very hot.

The heat generated in the wire can be minimized by replacing the wire with one of?

A thinner insulation.

B greater diameter.

Csmaller diameter.

Dthicker insulation.

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Question 12

waec 2021

Which of the arrangements of radiations below shows decreasing order of wavelengths?

A X-rays> radio waves > infrared radiations

BRadio waves> infrared radiations > X-rays

CInfrared radiations > radio waves > X-rays

D X-rays> infrared radiations > radio waves

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Question 13

waec 2021

The components of vectors Q and R are (-3.0, 5.5) and (9.2, 4.4) respectively. Determine the components of Q + R.

A (3.7, 7.4)

B(6.2, 9.9)

C (2.5, -4 .8).

D(14.7, 1.4)

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Question 14

waec 2021

Which of the following curved surfaces will produce a real image? I. Concave mirror II. Convex mirror III. Diverging lens IV. Converging lens

A I and III only

B I, II and IV only

C II, III and V only

DI and IV only

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Question 15

waec 2021

Determine the speed of the wave.

A64 cm/s

B32 cm/s

C24 cm/s

D72 cm/s

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Question 16

waec 2021

The sketched graph above represents a progressive wave moving from the left to the right. The period of the wave is 0.125s.

Determine the values of the amplitude and wavelength, respectively, of the wave.

A 8 cm; 27 cm

B 8 cm; 9 cm

C 4 cm; 9 cm

D16 cm; 27 cm

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Question 17

waec 2021

Which of the following statements about the universal gravitational constant, G, is true?

AIt is fundamental quantity.

BIt has dimension M-¹L³T-².

CIts S.I. unit is N m\(^2\)kg

DIt is a vector quantity

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Question 18

waec 2021

A current of 2A passes through a wire of resistance 4Ω for 3 minutes. Calculate the energy lost.

A 960J

B 1440J

C2880J

D48J

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Question 19

waec 2021

The diagram above is an illustration of an a.c. circuit.Calculate the reactance of the capacitor.

A2016Ω

B2000Ω

C200Ω

D4000Ω

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Question 20

waec 2021

Which of the following statements is an effect of compressing gas molecules at constant temperature?

AThe pressure on the molecules decreases.

BThe molecules gain more kinetic energy.

CThe molecules make more impact per second on the walls of the container.

DThe molecules increase in size.

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Question 21

waec 2021

A ball is swung in a horizontal circle of centre O with a constant speed. What is the direction of its acceleration?

AAway from O

BAlong the Circumference of the circle

CToward centre O

DAlong a tangent to the circle

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Question 22

waec 2021

Which of the following units is equivalent to the unit of electric current?

A C s\({-1}\)

B W

C J s\({-1}\)

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Question 23

waec 2021

An atom that emits an a-particle?

Amay become a different element.

Bbecomes a different isotope of the element.

Cdaughter with increased mass.

Dbecomes a daughter of a different element always.

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Question 24

waec 2021

The diagram above illustrates the velocity-time graph of a body. Calculate the distance covered by the body during the motion

A15m

B84m

C72m

D48m

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Question 25

waec 2021

The inductive reactance in a circuit of frequency 100Hz is 1ohms. Calculate the inductance of the inductor[π = 3.14]

A2.00 x 10\(_{-3}\)H

B1.59 x 10\(_{-3}\)H

C1.09 x 10\(_{-3}\)H

D6.28x 10\(_{-3}\)H

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Question 26

waec 2021

The handle of a screw jack is 35 cm long and the pitch of the screw is 0.5 cm. What force must be applied at the end of the handle to lift a load of 2000N, if the efficiency of the jack is 30% [π = \(\frac{22}{7}\)]?

A152.0N

B 132.0N

C15.2N

D440.0N

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Question 27

waec 2021

A student wishes to measure the potential difference across a resistor,R. She has a galvanometer,G and some connecting wires.

What else does she need?

Ahigh value resistor connected in parallel with G

B. low value resistor connected in parallel with G low value

Cresistor connected in series with G

Dhigh value resistor connected in series with G.

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Question 28

waec 2021

The acceleration of a moving object can be determined from the?

Aslope of its distance-time graph.

Barea under its distance-time graph.

Cslope of its velocity-time graph.

Darea under its velocity-time graph

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Question 29

waec 2021

A metallic sphere is heated from 27°C to 200°C Without change of state. Which of the following changes would have resulted from the heating?

ANo changes occur in its volume and density

BIts volume increases and its density increases

CIts volume increases and its density decrease

D Its volume increases without a change in density

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Question 30

waec 2021

Which of the following actions will increase capacitance of a parallel plate capacitor?

I. Decreasing the distance between the plates

II. Increasing the distance between the plates.

III. Increasing the area of the plates overlap.

IV. Avoiding the use of dielectric between the plate

A I and III only

B II and III only

C I and IV

D . III and IV only

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