SSC (Marathi Semi-English) 10th Standard Board Exam [इयत्ता १० वी] - Maharashtra State Board Important Questions for Science and Technology 1

Find the odd one out and justify it.
Fuse wire, M.C.B., Rubber Gloves, Generator

Why does tungsten metal used to make solenoid type coil in an electric bulb?

Observe the following figure which bulb get fuse?

Study the following principle and answer the question.
A force is excreted on the current carrying conductor. The direction of this force depends on both the direction of the current and the direction of the magnetic field. This force is maximum when the direction of current is perpendicular to the direction of the magnetic field.
a) By which law we can determine the direction of force excreted on the current carrying conductor.
b) In which electrical equipment this principle is used.
c) Draw a diagram representing construction of this equipment.
d) Write the working of this equipment in brief.

Observe the following diagram and choose the correct alternative:

Two tungsten bulbs of power 50 W and 60 W work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?

Give scientific reason :
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc., an alloy such as Nichrome is used, not pure metals.

Match the column ‘A’ with column ‘B’.

Differentiate between conductors and insulators.

State Fleming’s Right Hand Rule.

Answer the following:

State the principles of the electric motor and electric generator. 

Name any six domestic appliances based on the heating effect of electric current.

Rewrite the following statement by selecting the correct option:

1 A = ____________ mA.

Explain ‘Electric generator’ with the help of the following points:

1. Diagram of an AC Generator with labelling
2. Principle of an electric generator
3. The function of slip rings
4. Any two uses of a generator.

Answer the following question:
what is the heating effect of the electric current? state any four applications of it?

Answer the following question:
State the effect on the magnetic needle in Oersted’s experiment when:  
(a) the current is passed through the wire.  
(b) the current through the wire is increased
(c) the current through the wire is reversed. 

Choose the correct option:

A conductor rod of length (l) is moving with velocity (v) in a direction normal to a uniform magnetic field (B). What will be the magnitude of induced emf produced between the ends of the moving conductor?

Observe the given figure of Fleming’s Right Hand Rule and write the labels of A and B correctly.

Read the given passage and answer the following questions:

The home electrical connection consists of ‘live’, ‘neutral’ and ‘earth’ wires. The ‘live’ and the ‘neutral’ wires have potential difference of 220 V. The ‘earth’ is connected to ground. Due to a fault in the equipment or if the plastic coating on the ‘live’ and the ‘neutral’ wires gives a way the two wires come in contact with each other and a large current flows through it producing heat. If any inflammable material (such as wood, cloth, plastic, etc.) exists around that place it can catch fire. Therefore a fuse wire is used as a precautionary measure.

1. Name the two wires having potential difference of 220 V.
2. What is a short circuit?
3. Write the function of a fuse.