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Class 10 Chapter Electricity Questions from CBSE Board Paper 2017

24/5/2017

1 Comment

 
Q. Mention one reason why tungsten is used for making filament of electric lamp. [CBSE 2014]
Ans: tungsten does not oxidize, i. e. burn easily at high temperatures as it has higher melting and boiling point than metals

Q. List two characteristics of the material to be used in fuse wire. Name the material it is made of. A fuse is always connected in series in an electric circuit ? Justify this statement giving reason [CBSE 2014]
Answer: 
two characteristics of the material to be used in fuse wire
(a) Low melting and boiling point (b) high electric resistance

Fuse is generally made up of  an alloy of tin and lead

In series connection the current for the entire house pass through the fuse. So, when fuse melts , it breaks down the entire home circuit and no current flows to the household circuitry. Thus, a fuse is always connected in series

Q. A circuit has a line of 5 A. How many lamps of rating 40 W; 220 V can simultaneously run on this line safely ?[CBSE 2014]

Solution :  P = VI so, I = P/V = 40/220 


No of lamp  can simultaneously run on this line safely  = 5A/(40/220 )A = 27

Q. Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Solution :
Resistance R 1 of the bulb = V^2/p1 = (220)2/10 = 4840   Ohm

Let lamps can be connected in parallel with each other

According to O hm’s law, V = I R 
Where, R is the total resistance of the circuit for x number of electric bulbs
R = V/I = 220/5 = 44 Ohm
Number  of lamp = 4840/44 = 110

Q. Express work done in an electric field in terms of charge and potential difference. Calculate the amount of work done in carrying a charge of 5 mC against a potential difference of 100 V [CBSE 2014]

Solution : Work dome  = charge x  potential difference    
the amount of work done in carrying a charge of 5 mC against a potential difference of 100 V = 5 × 10^3 × 100 = 0. 5 J

Q. Distinguish between kilowatt and kilowatt hour. For a heater rated at 4.4 kW; 220 V  . Calculate  the -
(i) current drawn by the heater                                               (ii) resistance of the heater element
(iii) energy consumed by the heater in 5 hours                (iv) cost of running the heater if 1 kWh costs Rs. 6.50 [CBSE 2014]


Answer: Kilowatt is the unit of Power where as KiloWatt Hour is the commercial unit of energy. 

Given, P = 4.4 kW = 4400 W      and  V = 220 volts 

(i) As P = V /I  So, I = P/V = 4400/220 = 20 A 

(ii) As P = I^2R  So, R = P/I^2  = 4400/(20) 2 = 11 ohms 
(iii) since, electric energy = electric power X time = 4.4 kW X 4 hours = 17.6 kWh 
(iv) Since, 1KwH costs Rs. 6.50, hence, costs of  17.6 kWh  =  17.6 X 6.50 = Rs. 114.4 

Q.Distinguish between resistance and resistivity of a conductor. 
The resistors are generally made of thin wires of Eureka or Manganin while the wires used in connections are made comparatively thicker and are of copper or aluminium. Why ? Give reason. 


What would happen to the resistance of a wire if it is stretched to double its length ? Justify your answer.[CBSE 2014]
Solution : 

Resistivity 
1. It is the measure of a material’s ability to oppose the flow of current.
2. It depends on the property of the material. Its value is constant for a particular range of temperature.
3. Unit of resistivity is Ohm meter

Resistance 
1. It is a measure of the opposition that a circuit (or an electrical element) offers to the flow of electric current.
2. Resistance of a conductor is directly proportional to its length and inversely proportional to its area of cross­ section.
3. Unit of resistance is Ohm

 The resistors are generally made of thin wires of Eureka or Manganin while the wires used in connections are made comparatively thicker and are of copper or aluminium. This is because thicker wire has less resistance than thinner wire 


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1 Comment

life processes class 10 extra questions

10/5/2017

16 Comments

 
Picture
1 MARKS QUESTIONS
[These material are related to biology notes class 10 cbse life processes , life processes class 10 pdf , life processes class 10 extra questions , class 10 science chapter 6 life processes
life processes class 10th , ppt on life process for class 10 , life processes questions , mcq class 10 biology life processes]

1. A farmer floods his field everyday thinking that watering in this manner will result a better yield of his wheat crop. What will be the result of this action of the farmer.

Ans.This will result in water logging of the soil due to which roots cannot breathe and ultimately plants will die .

2. Name the term for transport of food from leaves to other parts of plants.

Ans.Translocation

3. Which pancreatic enzyme is effective in digesting proteins?

Ans.Trypsin

4. Which enzyme is present in saliva breaks down starch?

Ans.Salivary amylase.

5. After a vigorous exercise you may experience cramps in your leg muscles. Why does this happen?

Ans.Accumulation of lactic acid.

6. Name the organelle in which photosynthesis occurs.

Ans.Chloroplast.

7. Name the type of blood vessels which carry blood from organs to the heart.

Ans.Veins.

8. Name the respiratory structures of i.Mosquito ii)earth worm.

Ans.(i) mosquito—System of air tubes. (ii)earth worm—moist skin.

9. Write the two functions of kidneys.

Ans.Osmoregulation and excretion.

10. What are spiracles.

Ans The holes found on the lateral side of insect‘s body.

2 MARKS QUESTIONS 

X Biology Study notes extra questions  for Chapter Life Process  Download

Chapter 6 Life Processes Study Notes          Download 
Life Process  Solved question                           Download 
Life Process  CBSE Guess Paper                      Download   
Life Process  CBSE Test  Paper  -1                  Download 
Life Process  CBSE Test  Paper  -2                 Download     
Life Process  CBSE Test  Paper  -3                 Download 
L Life Process  CBSE Test  Paper  -4             Download   
Life Process  CBSE Test  Paper  -5                 
Download   

Searches related to life process notes for class 10
Biology class 10 life processes notes 
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