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2,483 questions

Question 1 of 20 2,483 total questions

Question 391

jamb 2015

If the volume of a gas is recorded as 76cm3 at a temperature of 27°C with a pressure of 800mmHg. What will be the volume of the gas at S.T.P?

A36.2cm³

B25.7cm³

C72.8cm³

D24.3cm³

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Question 392

jamb 2014

A glass bottle of initial volume 2 x 10\(^4\) cm\(^3\) is heated from 20ºC to 50ºC. If the linear expansivity of glass is 9 x 10\(^{-6}\)K\(^{-1}\), the volume of the bottle at 50ºC is

A20016.2cm³

B20005.4cm³

C20008.1cm³

D20013.5cm³

View Explanation & Discuss

Question 393

jamb 2014

What type of reaction is represented by the equation \(^{2}_{1}X+^{2}_{1}X\rightarrow^{3}_{2}Y+^{1}_{0}n+Energy\)

AIonization

BFusion

CFission

DChain

View Explanation & Discuss

Question 394

jamb 2014

When \(^{210}_{82}Pb\) decays to \(^{206}_{80}Pb\), it emits

Atwo alpha and two beta particles

Ban alpha particle

Cone beta particle

Done alpha and one beta particle

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Question 395

jamb 2014

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

AMetre

BAmpere

CNewton

DSecond

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Question 396

jamb 2014

Which gas produces a red coloured light in a discharge tube?

AMercury

BArgon

CAir

DNeon

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Question 397

jamb 2014

Calculate the mass of the copper deposited during electrolysis when a current of 4A passes through a copper salt for 2 hours. [Ece of Copper z=3.3x10^-7kgC^-1]

A2.9x10⁵kg

B9.5x10^-7kg

C9.5x10^-3kg

D2.9x10⁴kg

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Question 398

jamb 2014

When an atom undergoes a beta decay, the atomic number of the nucleus

ARemains unchanged

BDecreases by one

CIncreases by one

DBecomes zero

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Question 399

jamb 2014

The magnitude of the angle of dip at the equator is

A360^o

B0^o

C90^o

D180^o

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Question 400

jamb 2014

What is the best method of demagnetizing a steel bar magnet?

AHammering

BHeating it

CRough handling it

DSolenoid method

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Question 401

jamb 2014

PHCN measures its electrical energy in

BKWh

CWh

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Question 402

jamb 2014

A circuit has a resistance of 200Ω. The resistance of the circuit can be reduced to 120Ω when

AA 300Ω resistor is connected to it in parallel

BAn 80Ω resistor is conneceted to it in series

CA 150Ω resistor is connected to it in parallel

DA 240Ω resistor is connected to it in series

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Question 403

jamb 2014

The maximum power transfer occur in a cell when the external resistance is

ATwice the internal resistance of the cell

BThe same as the internal resistance of the cell

CGreater than the internal resistance of the cell

DLess than the internal resistance of the cell

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Question 404

jamb 2014

What charge is stored in a 0.1F capacitor when a 10V supply is connected across it?

A1C

B5C

C4C

D2C

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Question 405

jamb 2014

When a negatively charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf

ARemains the same

BCollapses

CCollapses and diverges again

DDiverges

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Question 406

jamb 2014

When a telescope is in normal use, the final image is at

AInfinity

BThe focus

CThe radius of curvature

DThe near point

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Question 407

jamb 2014

In a compound microscope, the objective and the eye piece focal lengths are

AAt infinity

BLong

CShort

DThe same

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Question 408

jamb 2014

The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at

A2.7m

B2.0m

C2.3m

D2.5m

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Question 409

jamb 2014

An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.

A2.5x10²

B2.5x10^-2

C2.5x10^-1

D2.5x10¹

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Question 410

jamb 2014

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill? [ speed of sound in air = \(340ms^{-1}\)

A528m

B66m

C136m

D264m

View Explanation & Discuss

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