Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.

Residual magnetism in steel for magnets is increased by the addition of

A

Nickel

B

Cobalt

C

Tungsten

D

Chromium

Mr.Rohan while helping the students of Class IV in adding and subtracting fractions observed that several students are not able to complete the addition of two improper fractions. He gave a small test with questions from the addition of proper fractions (one item of addition of two similar fractions, three items from the addition of proper and improper fractions, and four items from the addition of improper fractions). He analyzed the responses of each student and found that nearly 45% of students were not clear in adding proper with improper fractions which were affecting their performance in adding two improper fractions. He, therefore, focused on developing the understanding of improper fractions and their addition with proper fractions after which he proceeded to teach the addition of two improper fractions. Which kind of assessment is depicted by this situation?

A

Assessment OF Learning

B

Assessment for Learning

C

Assessment AS Learning

D

Assessment by learning

The residual magnetism of a self excited DC generator is lost. To build up its emf what to be done to regain the residual magnetism?

A

The field winding must be excited by double the rated DC voltage

B

The armature connection must be reversed

C

The field winding connection must be reversed

D

Field winding must be excited by low voltage DC supply

In DC machines the residual magnetism is present. The order of residual magnetism is ___________

A

2 to 3 per cent

B

10 to 15 per cent

C

20 to 25 per cent

D

50 to 75 per cent

In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. 1. Magnets have south and north poles. P. Electromagnets are similar to other magnets but their magnetic properties are temporary. Q. Opposite poles of two magnets attract whereas like poles repel each other. R. This is the basic principle behind electromagnetic propulsion. S. It is easy to create a small electromagnet. 6. You only have to connect the ends of a copper wire to the negative and positive ends of an AA, C or D-cell.

A

PQSR

B

PSRQ

C

QRPS

D

QPSR

In a circuit diagram, Electricity and Magnetism mcq question image

The given symbol is used as follows:

A

A wire joint

B

A battery B

C

An electric bulb

D

A resistor of resistance R

The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

A

Chromium

B

Nickel

C

Vanadium

D

Cobalt

In the circuit given below, what is the current flowing in 6Ω resistances?
Electricity and Magnetism mcq question image

A

0.22

B

0.55 A

C

2.22 A

D

2.775 A

The symbol represents.
Electricity and Magnetism mcq question image

A

unconnected wire crossing

B

a voltmeter

C

variable resistance or current controller

D

a resistance of resistance R

Use of signal in an electrical circuit. It is indicated by . . . . . . . .?

A

Rheostat

B

Resistor

C

Wire joint

D

Electric cell

Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.

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