SSC (English Medium) १० वीं कक्षा - Maharashtra State Board Question Bank Solutions for Science and Technology 1

Write the name from the description.

The group with valency zero.

Give a scientific reason:

For electric power transmission, copper or aluminium wire is used.

Give Scientific reason.

In practice, the unit kWh is used for the measurement of electrical energy, rather than joule.

Write the name from the description.

The family of metals having valency one.

Write the name from the description.

The family of metals having valency two.

Write the name from the description.

The metalloids in the second and third periods.

Write the name from the description.

Nonmetals in the third period.

Write the name from the description.

Two elements having valency 4.

Identify the figure and give its use.

Identify the figure and give its use.

Heat energy is being produced in a resistance in a circuit at the rate of 100 W. The current of 3 A is flowing in the circuit. What must be the value of the resistance?

Solve the following example.

Two tungsten bulbs of wattage 100 W and 60 W power work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor? 

An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical consumption expenses for that in the month of April? (The electric company charges Rs 5 per unit of energy).

Solve the following example.

Three lenses having power 2, 2.5 and 1.7 D are kept touching in a row. What is the total power of the lens combination? 

Explain the term of Metallurgy .

Statement 1 : Electric current ( flow of electrons ) creates heat in the resistor.
Statement 2 : Heat in the resistor is created according to the rule of energy conservation.
Explain Statement 1 with the help of Statement 2.

Statement 1 : Electric current ( flow of electrons ) creates heat in the resistor.
Statement 2 : Heat in the resistor is created according to the rule of energy conservation.
Explain Statement 1 with the help of Statement 2.

Complete the following flow chart and answer the questions below:

i) In which method pine oil is used?
ii) Explain what method of concentration in brief.

i) Observe the following reaction and answer the following questions.
`CuSO_4 (aq) + Fe (s) →  FeSO_4(aq) + Cu (s)`
a) Identify and write the type of chemical reaction.
b) Write the definition of above reaction.

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