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]
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?
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]
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
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
See full Questions and answer
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.
3. Which pancreatic enzyme is effective in digesting proteins?
4. Which enzyme is present in saliva breaks down starch?
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.
7. Name the type of blood vessels which carry blood from organs to the heart.
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
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Very Short Answer Type Questions (1 mark each)
Q. 1. Mention the angle between a current carrying conductor and magnetic field for which the force experienced by this current carrying conductor placed in magnetic field is largest.
Ans. The angle between current carrying conductor and magnetic field is 90 deg.
Q. 2. Mention the advantage of A.C. over D.C. for long distance transmission.
Ans. A.C. can be easily transmitted over long distances without much loss of energy.
Q. 3. In domestic electric circuit, with which wire do we connect a fuse ?
Ans. Live wire.
Q. 4. List any one point of difference between A.C. and D.C.
Ans. Direct current always flows in one direction and alternating current reverses its direction periodically.
Q. 5. Name the physical quantities which are indicated by the direction of thumb and forefinger in the Fleming s right hand rule ?
Ans. Direction of motion of the conductor and direction of field.
Q. 6. Name the device used to prevent damage to the electrical appliances and the domestic circuit due to overloading.
Ans. Electric fuse.
Q. 7. Name the type of current : (a) Used in household supply. (b) Given by a cell.
Ans. (a) Alternating current 1/2 (b) Direct current.
Q. 8. State the value of potential difference between the live wire and the neutral wire in our country.
Ans. 220 V
Q. 9. State the effect on the strength of magnetic field produced at a point near a straight conductor if the electric current flowing through it increases.
Ans. The strength of the magnetic field increases.
Q. 10. State a difference between the wires used in the element of an electric heater and in a fuse.
Ans. The melting point of the wire used in heater elements is high while a fuse wire has low melting point.
Q. 11. State the observation made by Oersted on the basis of his experiment with current carrying conductors.
Ans. Every current carrying conductor has a magnetic field around it.
Q. 12. Suggest one way of discriminating a wire carrying current from a wire carrying no current.
Ans. Bring a magnetic needle near the wire, a current carrying wire will produce a deflection in the needle whereas a wire without current will not.
Q. 13. List two sources of magnetic fields. Magnet, moving charges, electric current. (any two) State the effect of a magnetic field on the path of a moving charged particle
Ans: It can deflect the path of the charged particle.
Q.14. An alternating current has a frequency of 50 Hz. How many times does it change its direction in one second ?
Ans: 100 times.
Q.15. State the use of earth wire in domestic electric circuit.
Ans: To ensure that any leakage of current to the metallic body of the appliance does not give shock to the user. Q.16. State the conclusions that can be drawn from the observation that a current carrying wire deflects a magnetic needle placed near it.
Ans: A magnetic field exists around it. Read full papers
Q1: Name the two components of peripheral nervous system? 1
Q2: What are hot spots inside the earth's crust? 1
Q3: A charge of 150 C flows through a wire in one minute. Find the electric current flowing through it.1
Q4: Explain why an aqueous solution of sodium sulphate is neutral while an aqueous solution of sodium carbonate is basic in nature. 2
Q5: When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation for this reaction and state:
(i) the substance oxidised. (ii) the substance reduced in the reaction. 2
Q6: Why do herbivores have longer, smaller intestine than carnivores? 2
Q7: Select (i) combination reaction (ii) decomposition reaction and (iii)displacement reaction from the following chemical equations:
i. ZnCO (s) ───→ ZnO (s) + CO (g)
ii. Pb(s) + CuCl (aq) ───→ PbCl + Cu (s)
iii. NaBr (aq) + AgNO (aq) ───→ AgBr (s) + NaNO (aq)
iv. H (g) + Cl (g) ───→ 2HCl (g) 3
Q8: State the reason for the following:
i. Lemon is used for restoring the shine of tarnished copper vessels.
ii. A metal sulphide is converted into its oxide to extract the metal from the sulphide ore.
Q9: State reason for the following:
i. dry HCl gas does not change the colour of the dry blue litmus paper.
ii. alcohol and glucose also contain hydrogen, but do not conduct electricity.
iii. Concentration of H O+ ion is affected when a solution of an acid is diluted. 3
Q10: The rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms. Give reason. State the pathway of air from nostrils to lungs in human beings. 3
Q11: State the kind of chemical reactions in the following examples:
i. digestion of food in stomach ii. combustion of coal in air iii. Heating of limestone. 3
Q12: (a) State the formation of urine.
(b) What will happen if there is no tubular reabsorption in nephrons of kidney? 3
Q13: Mention three characteristic features of hormonal secretions in human beings. 3
Q14: The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the material of the wire is 50 × 10-8 Ωm, find the length of wire. 3
Q15: A circuit has line a line of 5A. How many lamps of rating 40W; 220V can simultaneously run on this line safely?3
Q16: Show four different ways in which four resistors of r Ω each may be connected in a circuit. In which case is the equivalent resistance of the combination. (i) maximum (ii) minimum 3
Q17: Amit lives in Delhi. He is much concerned about the increasing electricity bill of his house. He took some steps to save electricity and suceeded in doing so.
(i) Mention any two steps that Amit might have taken to save electricity. (ii) Amit fulfilled his duty towards the environment by saving electricity. How?
(iii) Which alternative source of energy would you suggest Amit to use? 3
Q18: List any three qualities of an ideal source of energy. 3
Q19: Write balanced chemical equation for the following statements:
(i) NaOH solution is heated with zinc granules.
(ii) Excess of carbon dioxide gas is passed through lime water.
(iii) Dilute sulphuric acid reacts with sodium carbonate.
(iv) Egg shells are dropped in hydrochloric acid.
(v) Copper (II) oxide reacts with dilute hydrochloric acid. 5
Q20: (a) Define corrosion
(b) What is corrosion of iron called?
(c) How will you recognise the corrosion of silver?
(d) Why corrosion of iron is serious problem?
(e) How can we prevent corrosion? 5
Q21: (a) Write three main features of the nervous system? (b) In the absence of muscle cells, how do plant cells show movement? 5
Q22: What is meant by resistance of a conductor?
Name and define its SI unit?
List the factors on which the resistance of a conductor depends.
How is the resistance of a wire affected if: (i) its length is doubled, (ii) its radius is doubled? 5
Q23: (a) Draw magnetic field lines of a bar magnet. "Two magnetic field lines
never interact with each other". Why?
(b) An electric oven of 1.5 kW is operated in a domestic circuit (220V) that
has a current rating of 5A. What result do you expect in this case? Explain. 5
Q24: (i) Establish a relationship to determine the equivalent resistance R of combination of three resistors R1, R2 and R3 connected in parallel.
Q34: An iron nail is dipped in the solution of copper sulphate for about 30 minutes, state the change in colour observed. Give the reason for the change. 2
Q35: A student verifying Ohm's law computed the value of resistance of a resistor for each set of observation. However the values of the resistor were slightly different from the actual value. Is his experiment wrong? Justify your answer.
Q36: Draw a labelled diagram of stomatal apparatus with closed stomatal pore. Label its different parts and show the directions of water flowing. 2
Solved SA-1( Sep_2015) Original Question papers Download
Control and Coordination solved CBSE Test paper-01
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Electric current indicates electric charges in motion. Dynamics deals with bodies in motion. The science of electricity in motion is known as electrodynamics
The voltmeter is a high-resistance galvanometer used to measure voltage. It measures the potential difference across any two points in an electric circuit and must always be connected in parallel that is, connected by means of a wire to either side of the device across which the voltage drop is to be measured.
The ammeter (A) is connected in series in the circuit so that all current passing through the circuit must pass through and be measured by the ammeter.
New addition of Study material Chapter: Electricity 10th Science
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Control: is the power of restrain and regulation by which something can be started, slowed down,
expedited or stopped.
Coordination: (L. co-joint, ordinates-regulated) is orderly or harmonious working of different but inter-related parts so as to perform one or more activities very smoothly.
Need for control and coordination in an organism:
The body of a multicellular organism consists of a number of components and sub-components; each specialized to perform a particular function. However, all the components are not required to function all the time at the same speed. A system of
controls is required to function all the time at the same speed. A system of controls is required to allow them to perform or not to perform, slow down or speed up their working. Further, most activities require the simultaneous or sequential functioning of a number of parts, stopping some and stimulation others. During feeding, eyes locate the food, nose registers its smell, hands pick up the food and take it to mouth, mouth opens to receive the food, teeth and muscles take part in its mastication and saliva
moistens it. Tongue perceives its taste. It moves the food below the teeth. Later it pushes the crushed food into pharynx. All this is possible only through a system of coordination.
CBSE_NCERT Chapter 7 Control and Coordination Biology
X Control and Co-ordination Study Notes
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NCERT Solutions For Class 10 Science
1) Magnetic fields are produced due to
A. Stationary charges
B. Moving charges Ö
C. Both a and b
D. None of the above
2) 1 Gauss =
A. 10⁴ Tesla
B. 1000 Tesla
C. 10⁻⁴ Tesla Ö
D. None of the above
3) The magnetic field density along the axial line of a circular coil carrying current
C. Varies with distance from the center of the coil Ö
D. None of the above
4) In magneto statics, the magnetic field generated by a steady current is given by
A. Biot-Savart’s Ö
B. Law Lenz’s Law
C. Faraday’s Law
D. Ohm’s Law
5) The magnetic field developed at different points on the axial line of a circular coil is
A. Directly proportional to the current Ö
B. Inversely proportional to the current
C. Independent of the current
D. Directly proportional to the square of the current
6) What is the nature of the magnetic field inside current carrying loop?
A. randomly in all directions
B. all in one directionÖ
C. all fields cancel each other (no magnetic field)
D. none of the above
7) The functioning of an electric motor is based on
A. thermal properties of a wire
B. magnetic effect of a permanent magnet
C. magnetic effects of currentÖ
8) The loops in the conductor repel each other when current is passed through them.
A. depends on the type of current
B. (AC/DC) depends on the radius of the loops
9) Which of the following about a magnetic field is correct?
A. The unlike magnetic poles repel.
B. A magnetic pole can be isolated.
C. The magnetic field lines indicate the direction of
D. A magnetic pole cannot induce magnetic poles in other materials.
10) Amit attaches one end of a string to a steel paper clip and the other end to a table. The string is very light. He then uses a magnet to attract it so the clip seems to float in air. However, when she lifts the magnet, the paper clip falls. What is the reason for this?
A. The potential energy of the clip decreases.
B. The gravitational force near the magnet increases.
C. The magnetic properties of the clip decreases.
D. The magnetic field strength near the clip decreasesÖ
11) A rod P is hung on a string and then another rod Q is brought near it. P and Q attract each other. Which of the following statements is correct?
A. P must be a magnetic object.
B. Q must be a magnetic object.
C. Both P and Q must be magnetic objects.
D. It is possible that P and Q both are magnetic objects or only one of them is.Ö
12) A piece of metal can be deduced to become a magnet if
A. both ends of a compass needle are attracted to it.
B. a magnet is attracted to it.
C. one end of a compass needle is repelled by it.Ö
D. copper wire is repelled by it.
13) Which of the following statements describes an example of induced magnetism?
A. A bar magnet, swinging freely, comes to rest
B. A bar magnet loses its magnetism if it is
C. A bar magnet attracts a piece of soft iron.Ö
D. It is hard to magnetise steel, but easy to
magnetise soft iron.
14) A metal bar X-Y hung by a thread always settles in no definite direction. Another bar P-Q of the same metal always comes to rest with end P pointing North. What is the result if the two bars are brought near one another?
A. P attracts X but repels Y.
B. P neither attracts nor repels X.
C. P attracts X but Q repels Y.
D. P and Q both attract X.Ö
15) Which of the following is suitable to be used for the needle of a plotting compass?
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