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4,719 questions

Question 1 of 20 4,719 total questions

Question 2191

jamb 1985

Two divers G and H are at depths 20m and 40m respectively below the water surface in a lake. The pressure on G is P1 while the pressure on H is P2. If the atmospheric pressure is equivalent to 10m of water, then the value of \( \frac{p_2}{p_1} \) is?

A0.50

B0.60

C1.67

D2.00

E3.0

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Question 2192

jamb 1985

A force of 100N stretches an elastic string to a total length of 20cm. If an additional force of 100N stretches the string 5cm further, Find the natural length of the string

A15cm

B12cm

C10cm

D8cm

E5cm

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Question 2193

jamb 1985

A 0.05kg bullet travelling at 500ms^-1 horizontally strikes a thick vertical wall. It stops after penetrating through the wall horizontal distance of 0.25m. What is the magnitude of the average force the wall exerts on the bullet?

A25N

B50N

C250N

D500N

E25 000N

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Question 2194

jamb 1985

Two masses 40g and 60g respectively, are attached firmly to the ends of the light meter rule. The center of gravity of the system is

Aat the mid-point of the meter rule

B40cm from the lighter mass

C40cm from the heavier mass

D60cm from the heavier mass

Eindeterninate because the meter-rule is light

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Question 2195

jamb 1985

Which of the following is NOT a force?

AFriction

BTension

CUpthrust

DWeight

EImpulse

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Question 2196

jamb 1985

A metal block of mass 5kg lies on a rough horizontal platform. If a horizontal force of 8N applied to the block through its center of mass just slides the block on the platform, then the coefficient of limiting friction between the block and platform is

A0.16

B0.63

C0.80

D1.60

E2.00

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Question 2197

jamb 1985

A block of mass 2.04kg resting on a smooth horizontal plane is acted upon simultaneously by two-forces, 10N due North and 10N due East. The magnitude of the acceleration produced by the force on the block is

A0.10ms^-2

B7.07ms^-2

C10.00ms^-2

D14.10ms^-2

E20.00ms^-2

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Question 2198

jamb 1985

If a car starts from rest and moves with a uniform acceleration of 10ms^-2 for ten seconds, the distance it covers in the last one second of its motion is

A95m

B100m

C500m

D905m

E1000m

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Question 2199

jamb 1985

Which of the following types of motion are oscillatory? i.a diving board when used by a diver. ii. the motion of the balance wheel of a wrist watch. iii. the motion of the turn-table of a record player. iv. the motion of the center of a ten kobo piece as it rolls down an inclined plane. v. the motion of the needle of a D.C. ammeter into which a low A.C. current is passed

Ai and ii

Bi, ii and iii

Cii, ii and iv

Di, ii and v

Eiii, iv and iv

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Question 2200

jamb 1985

Which of the following statements are true about the spring balance and the chemical balance? i. both are used to measure the mass of an object. ii. either of them may be used to measure the weight of an object. iii. the spring balance works on the principle of Hooke's law while the chemical balance works on the principle of moments. iv. a change in gravity does the readings of a spring balance but not that of a chemical balance.

Ai, and iv

Bii and iii

Cii and iv

Di, ii and iii

Ei and iii

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Question 2201

jamb 1985

A simple pendulum with a period of 2.0s has its length doubled. Its new period is

A1.00s

B1.41s

C0.3s

D2.83s

E4.00s

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Question 2202

jamb 1985

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

AMeter

BAmpere

CKelvin

DSeconds

ERadian

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Question 2203

jamb 1984

In the diagram above, X and Y have resistances 6 and 4 ohms respectively, if the power dissipation in X is 10W then power dissipation in Y is

A2.4W

C6.0W

D6.7W

E15.0W

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Question 2204

jamb 1984

In the circuit Shown above, calculate the effective capacitance between X and Y

A3/4µF

B\( 2 \frac{10}{13} µF\)

C12µF

D\( 4 \frac{12}{13} µF\)

E13µF

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Question 2205

jamb 1984

A short bar magnet is placed in earth's magnetic field, as shown above, which of the points II and III are/is possible positions of a neutral point?

AI only

BII only

CIII only

DI and II

EI,II and III

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Question 2206

jamb 1984

A force varying linearly with the distance acts on a body as shown above, The work done on the body by the force during the first 10m of motion is

A100J

B150J

C200J

D300J

E600J

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Question 2207

jamb 1984

What is the resistance of the circuit shown above

A4Ω

B11Ω

C19/5Ω

D17/4Ω

E8Ω

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Question 2208

jamb 1984

A simple pendulum, 0.6m long, has a period of 1.5s. What is the period of a similar pendulum of 0.4m length in the same location?

A\( 1.5 \frac{ \sqrt{2}}{3} \)s

B\( 1.5 \frac{ \sqrt{3}}{2} \)s

C2.25s

D1.00s

E2.00s

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Question 2209

jamb 1984

A galvanometer of resistance 5.0Ω has full-scale deflection for a current of 100mA. How would its range be extended to 1.0A? By placing a resistance of

A\(\frac{5}{9}\)\(\Omega\) in parallel

B\(\frac{9}{5}\)\(\Omega\) in series

C45\(\Omega\) in parallel

D45\(\Omega\) in series

E\(\frac{9}{5}\)\(\Omega\) in parallel

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Question 2210

jamb 1984

Which of the following statements is (are) NOT true about the emission of the photoelectrons from metallic surfaces?

i. all metallic surfaces emits the same number of photoelectrons in a given light

ii. most metallic surfaces emit the same number of photoelectrons in visible and infra-red light

iii. a metallic surface emits photoelectrons only if the frequency of the incident light is higher than its own characteristics threshold frequency

Ai only

Bii only

Ci and ii

Dii and iii

Eiii only

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