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

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?

Observe the figure and answer the following questions.
a) Identify the machine shown in figure.
b) Write a use of this machine.
c) How transformation of energy takes place in this machine.

When heat energy is absorbed by object ΔT represents the raise in temperature. What would be ΔT represent if the object loses heat energy?

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.

Write names of first four homologous series of alcohols.

Answer the following question:

Grills of doors and windows are always painted before they are used? Give reason.

 Answer the following:

What is corrosion? Do gold ornaments corrode? Justify.  

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

Explain the construction and working of an electric generator (AC) with the help of a neat diagram.