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2,483 questions

Question 1 of 20 2,483 total questions

Question 451

jamb 2012

An object moves in a circular path of radius 0.5m with a speed of 1ms^-1 What is its angular velocity?

A8 rads^-1

B4 rads^-1

C2 rads^-1

D1 rads^-1

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Question 452

jamb 2012

If a freely suspended object is pulled to one side and released, it oscillates about the point of suspension because the

Aacceleration is directly proportional to the displacement

Bmotion is directed away from the equilibrium point

Cacceleration is directly proportional to the square of the displacement

Dvelocity is minimum at the equilibrium ponit

View Explanation & Discuss

Question 453

jamb 2012

A rocket is fired from the earth's surface to a distant planet. By Newton's law of universal gravitation, the force F will

Aincrease as r reduces

Bincrease as G varies

Cremains constant

Dincreases as r increases

View Explanation & Discuss

Question 454

jamb 2012

A car starts from rest and moves with a uniform acceleration of 30ms^-2 for 20s. Calculate the distance covered at the end of the motion

A6km

B12km

C18km

D24km

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Question 455

jamb 2012

Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms^-1 with a constant retardation of 0.1m^-2

A5500m

B4500m

C4200m

D3000m

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Question 456

jamb 2012

A load is pulled at a uniform speed along a horizontal floor by a rope at 45^o to floor. If the force in the rope is 1500N, what is the frictional force on the load ?

A1524N

B1350N

C1260N

D1061N

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Question 457

jamb 2012

In order to remove the error of parallax when taking measurements with a metre rule, the eye should be focused

Aslantingly towards the right on the markings

Bslantingly towards the left on the markings

Cvertically downwards on the markings

Dvertically upwards on the markings

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Question 458

jamb 2011

Two resistors 5Ω and 10Ω are arranged first in series and later in parallel to a 24V source, the ratio of total power dissipated in the series and parallel arrangements respectively is

A5:3

B1:50

C50:1

D3:5

ENo Correct Option

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Question 459

jamb 2011

In an A.C circuit, the ratio of r.m.s value to peak value of current is

B\( \frac{1}{2} \)

C\( \frac{1}{\sqrt{2}} \)

D\( \sqrt{2} \)

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Question 460

jamb 2011

In Homes, electrical appliances and lamps are connected in parallel because

AParallel connections do not heat up the wires

Bindependence switches can be used

Cless current will be used

Dless voltage will be used

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Question 461

jamb 2011

If the volume of a gas increases steadily as the temperature decreases at constant pressure, the gas obeys

AGraham's Law

BBoyle's Law

CPressure law

DCharles Law

ENo Correct Option

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Question 462

jamb 2011

In the circuit above, three resistors, 2Ω, 4Ω and 12Ω are connected in parallel and a 12V battery is connected across the combination. The current flowing through the 12Ω resistors is

A14.4 A

B1.0 A

C3.2 A

D9.6 A

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Question 463

jamb 2011

A length of wire has a frequency of 225Hz when stretched by a force of 225N. If the force increased to 324N, what is the new frequency of vibration?

A270 Hz

B512 Hz

C488 Hz

D356 Hz

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Question 464

jamb 2011

An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?

A10 cm

B25 cm

C16 cm

D14 cm

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Question 465

jamb 2011

The correct expression for the potential at a point distance r from a charge q in an electric field is?

_q²

4πε_or²

_q²

4πε_or

4πε_or²

D\(\frac{q}{4πε_or}\)

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Question 466

jamb 2011

The diagram above show the positions of a cone. The position which can be described as neutral equilibrium is represented as

AZ only

BX only

CY and Z

DY and X

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Question 467

jamb 2011

The diagram above shows two vectors at right angles to each other. The value of the resultant vector is

A14.0 N

B10.0 N

C12.0 N

D13.0 N

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Question 468

jamb 2011

Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

AX is the anode and very high current is used

BX is the anode and Y is the cathode

CY is the cathode and X is the anode

DY is the anode and very high current is used

View Explanation & Discuss

Question 469

jamb 2011

If the threshold frequency for tungsten is 1.3 x 10¹⁵Hz, what is its work function?

[H = 6.6 x 10^-34 Js]

A8.58 x 10^-19 J

B8.50 x 10^-15 J

C8.58 x 10^-17 J

D8.85 x 10^-18

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Question 470

jamb 2011

The electrical properties of germanium can be altered drastically by the addition of impurity. This process is referred to as

Asaturation

Bbonding

Camplification

Ddopping

View Explanation & Discuss

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