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Physics Past Questions

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45 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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45 questions

Question 1 of 20 45 total questions

Question 11

jamb 1982

A high-resistance voltmeter reads 3.0V when connected across the terminals of a battery on open circuit and 2.6V when the battery supplies a current of 0.2A through a lamp. The resistance of lamp is

A2.00\(\Omega\)

B13.00\(\Omega\)

C0.52\(\Omega\)

D0.13\(\Omega\)

E1.50\(\Omega\)

View Explanation & Discuss

Question 12

jamb 1982

A heater marked 50W will evaporate 0.005kg of boiling water in 50 seconds. The specific latent heat of vaporization of water in J/kg is

A5.0 x 10⁶

B1.0 x 10⁶

C2.5 x 10⁶

D2.5 x 10⁵

E5.0 x 10⁵

View Explanation & Discuss

Question 13

jamb 1982

Which of the following statements is true of a body which is moving in a straight line with uniform acceleration? The velocity of the body

Ais also uniform

Bmust always be zero when the body stops accelerating

Cwill increase with time in the direction of the acceleration

Dis equal to the quotient of distance travelled and time

Eis the product of the distance travelled and time

View Explanation & Discuss

Question 14

jamb 1982

A rocket burns 0.01kg of fuel each second and ejects it as a gas with a velocity of 5,000m/s. What force does the gas exert on the rocket?

A500,000N

B500N

C50N

D5,000N

E50,000N

View Explanation & Discuss

Question 15

jamb 1982

Which of the following statements is NOT true of \(\gamma\)-rays?

A\(\gamma\)-rays belong to the electromagnetic spectrum

B\(\gamma\)-rays do not carry an electron charge

C\(\gamma\)-rays obey the inverse cube law in air

Dthe thickness of aluminium which stops b-particule has a negligible effect on \(\gamma\)-radiation

Ethe difference between \(\gamma\)-rays and X-rays is that \(\gamma\)-rays originate from energy charges in the nuclei of atoms, while X-rays comes from energy charges associated with the electron structure of atoms

View Explanation & Discuss

Question 16

jamb 1982

As a positively charge rod is brought nearer to the top cap of a positively charged gold leaf electroscope, the divergence of the leaves will

Adecrease to zero

Bsteadily increase

Cdecrease to zero and then increase

Dremain constant

Eincrease to a maximum and then decrease

View Explanation & Discuss

Question 17

jamb 1982

In copper plating, a current of 0.5A is allowed for cathode area of 100cm2. If this current is maintained constant for 100 minutes, the thickness of the copper deposited will be approximately (the electrochemical equivalent of copper = 0.0003g/oC, density of copper = 10^4g/cm3 )

A10^-2mm

B10^-3mm

C10^-4mm

D10^-5mm

E10^-6mm

View Explanation & Discuss

Question 18

jamb 1982

If the refractive index of a medium is \(\sqrt{2}\), what is the critical angle?

A45^o

B50^o12'

C56^o25'

D75^o

E90^o

View Explanation & Discuss

Question 19

jamb 1982

A rod of length 10cm is heated through 100^oC and its final length is 10.26cm. What is the co-efficient of linear expansion of the rod?

A0.026 per degree centigrade

B0.00026 per degree centigrade

C0.26 per degree centigrade

D1.0026 per degree centigrade

E0.0026 per degree centigrade

View Explanation & Discuss

Question 20

jamb 1982

Why does a piece of cork float on water?

Athere is no upthrust on it when completely immersed in water

Bthe upthrust on it when completely immersed in water is greater than its weight in air

Cthe upthrust on it when completely immersed in water is less than its weight in air

Dits specific gravity is greater than that of water

Eits specific gravity is the same as that of water

View Explanation & Discuss

Question 21

jamb 1982

The combination of sound waves with different frequencies is known as

Ainterference

Bdiffraction

Csuperposition

Dforced vibration

Eresonance

View Explanation & Discuss

Question 22

jamb 1982

An object 15cm high is 30cm from pin-hole camera. If the height of the image formed at the back of the camera is 10cm, the image distance is

A20cm

B45cm

C54cm

D63cm

E70cm

View Explanation & Discuss

Question 23

jamb 1982

250g of lead at 170^oC is dropped into 100g of water at 0^oC. If the final temperature is 12^oC, the specific heat of lead is (specific heat of water is 4,200J/kg^oC)

A39.5J/kg^oC

B50.4J/kg^oC

C127.6J/kg^oC

D154.6J/kg^oC

E173.4J/kg^oC

View Explanation & Discuss

Question 24

jamb 1982

Which of the following statements is NOT true? Thermostats are used to control the temperature of

Apressure cookers

Blaundry irons

Chot water storage tanks

Daquaria for tropical fish

Eheated apartments

View Explanation & Discuss

Question 25

jamb 1982

The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a

Apipette

Bburette

Cmeasuring cylinder

Ddensity bottle

Eeureka can

View Explanation & Discuss

Question 26

jamb 1982

Which of the following machines does NOT apply the lever principle?

Aclaw hammer

Bwheel barrow

Csingle moving pulley

Dsugartongs

Enutcrackers

View Explanation & Discuss

Question 27

jamb 1982

A mango fruit drops from a branch 10m above the ground, just before hitting the ground its velocity is (g = 10ms^-2)

A10√2ms^-1

B10ms^-1

C100ms^-1

D5√2ms^-1

E200ms^-1

View Explanation & Discuss

Question 28

jamb 1982

The force responsible for holding the moon in its orbit around the earth against the gravitational pull of the earth is

Acentrifugal

Brotational

Creaction

Dcentripetal

Etractional

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Question 29

jamb 1982

An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is

A62.5A, 4.0\(\Omega\)

B16.0A, 62.5\(\Omega\)

C62.5A, 16.0\(\Omega\)

D4.0A, 62.5\(\Omega\)

E4.0A, 250\(\Omega\)

View Explanation & Discuss

Question 30

jamb 1982

The echo of a sounder from the bottom of an ocean is heard 2.5 seconds later. If the speed of sound in water is 1,400ms-1, the depth of the ocean is

A1,750m

B3,500m

C1,400m

D2,800m

E2,100m

View Explanation & Discuss

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