Question

what are the answers for these mcqs.. pls help

IRRELEVANT ANSWERS WILL BE REPORTED!
AND GOODANSWERS WILL BE FOLLOWED AND MARKED AS BRAINLIEST ​

Answer 1

ANSWER :-

1)_______is a double displacement reaction

Ans:-XY+AB---->XA+YB

Explanation:-

Here it is shown a reaction between XY and AB in which the products formed are XA and YB .Clearly X displaces B to form XA and Y displaces A to form YB

2)______device is based on the principle of electric motor.

Ans:-Galvanometer

Explanation:-

As we know current-carrying coil when placed in an external magnetic field experiences magnetic torque. The angle through which the coil is deflected due to the effect of the magnetic torque is proportional to the magnitude of current in the coil.

3)The resistance in electric conductor is depends on________

Ans;-Length of conductor and cross section of area

Explanation:-

The resistance of the conductor depends on the following factors: The temperature of the conductor. The cross-sectional area of the conductor. Length of the conductor.

If the length of conductor is more then the resistance also will be more.if the length of conductor is Less then the resistance will be less. And Resistance  is inversely proportional to area of cross section.

4)Concave mirror is not used in _______

Ans:-Right and left side mirror on car

Explanation:-

The side mirrors of the car and the rear view mirror of a car are made up of convex mirrors. This is because the image formed by a convex mirror is diminished and erect image, thus it provides a larger field of view. A larger field of view helps the driver to know better about the traffic behind.

5)________acceleralation is produced if the force is applied on an object of mass 0.5 kg

Ans:-1 m/s²

Explanation:-

Taking F=0.5 N

F=ma

a=F/m

a=(0.5/0.5)m/s²

a=1 m/s²

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