PHYSICS
ELECTRICITY
MULTIPLE CHOICE QUESTIONS
1. The S I unit of potential difference is (MQP –1)
(A) volt (V) (B) ampere (A)
(C) coulomb (C) (D) ohm meter (Ωm)
2. The S I unit of electric current is (MQP –2)
(A) ampere (A) (B) ohm (Ω)
(C) volt (V) (D) watt (W)
3. The rate of energy consumed in an electrical circuit is, electric (MQP –3)
(A) current
(B) potential difference
(C) resistance
(D) power
4. When three resistors of different resistance are connected in parallel in an electric circuit and switched on, then the quantity that remains the same in all the resistors is (MQP –4)
(A) current
(B) potential difference
(C) resistance
(D) resistivity
5. The SI unit of potential difference (preparatory – 1)
(A) volt (B) Ampere
(C) coulomb (D) ohm metre
6. The SI unit of resistivity is (preparatory – 2)
(A) ohm-metre (B) coulomb
C) volt (D) joule
ONE MARK QUESTIONS
1. Write the symbols of the following components used in the electric circuit. (MQP –1)
(i) Dry cell (ii)Rheostat
2. Draw the symbols of the following components used in an electrical circuit. (MQP –3)
i) Rheostat ii) Wires crossing without joining
3. Write the diagrams of the symbols of the following components used in an electric circuit:
i) Rheostat or variable resistance (preparatory – 1)
ii) Wire crossing without joining.
4. Mention the role of fuse in the domestic circuit. (preparatory – 2)
TWO MARKS QUESTIONS
1. Mention the factors on which resistance of a conductor depend. (MQP –1)
2. Draw a simple electric circuit. Label ammeter and voltmeter (MQP –2)
3. An electric motor receives 10A electric current from 220V electric source. Find the power of
Motor (MQP –2)
4. How does the resistance of a conductor related to the length of the conductor and the area of cross-section of that conductor? (MQP –3)
OR
The resistivity of some materials found at 20o C is given in the table below. Look at it and answer the questions given below
a) Which is the better conductor among silver and copper? Why?
b) Alloys are used in electric heating devices. Why?
5. Among nichrome and copper wires, which of the wires is used in electric fan and in the coils of electric heater? Why? (MQP –4)
6. Observe the given diagram and calculate the total resistance in the given electric circuit.(Preparatory – 1)
7. If the total resistance in the given circuit is 4Ω then find the resistance of the resistor X.(Preparatory – 2)
FOUR MARKS QUESTIONS
1. a) Observe the below table. Which of the below listed electrical appliances consumes more energy? (MQP –1)
b) 2 Ω and 4 Ω resistors are connected in parallel. If 6 Ω resistor is used in place of 4 Ω, then find the difference between the difference between the total resistance obtained in both of these arrangements.
OR
a) A 350W bread toaster is used 6 hours a day. A 250W iron box is used 4 hours a day. If these appliances are used for 30 days, then calculate the total cost of the energy consumption at the rate of Rs. 4 for 1kWh.
b) A fan having the power 880W is connected to a source of potential difference 220V in an electric circuit. Calculate the electric current and the electric resistance of this circuit.
2. a) State Joule’s law of heating and name four appliances which work on the heating effect of electricity.
b) Give reason. (MQP –2)
(i) The tungsten is used almost exclusively for filament of electric lamps.
(ii) Copper and aluminium wires are usually employed for electricity transmission.
OR
a) State ohm’s law. List the factors on which the resistance of conductor depends.
b) “The potential difference between two points is 1V.” Mention the meaning of this statement.
3. a) Observe the diagram of below given electric circuit. Find the total resistance and the total current of the circuit. (MQP –3)
b) An electric fan rated 50 W is used for 6 hours in a day. What is the cost of the energy it consumes for 30 days at Rs.4 per 1kWh?
4. a) Two resistors of resistance 10Ω and 40Ω are connected in series and connected to a 12V battery. Calculate the equivalent resistance in the electric circuit and the total current flowing in the circuit.
b) A washing machine rated 500W is used for 2 hours a day for 30 days. Calculate the cost of using this appliance at 3 Rs per 1 kWh. (MQP –4)
OR
a) Resistance of a metal wire of length 2 m is 28 Ω at 20°C. If the diameter of the wire is 0.04 mm then, what will be the resistivity of the metal at that temperature?
b) 1000 J of heat is produced each 2 seconds in a 5Ω resistor. Find the potential difference across the resistor.
5. a) List the factors on which the resistance of a conductor depends. (Preparatory – 1)
b) Write the mathematical form of Joule’s law of heating. Name any two devices that work on the basis of Joule’s law of heating.
6. a) State Ohm's law. List the factors on which the resistance of the conductor depends. (Preparatory – 2)
b) "The potential difference between two points of a conducting wire is 1 V." Write the meaning of this statement.
MAGNETEIC EFFECTS OF ELECTRIC CURRENT
MULTIPLE CHOICE QUESTIONS
1. Observe the figure given below. The magnetic field at the centre ‘C’ of circular coil is (MQP –2)
(A) zero (B) I (C) 2I1 (D) 2I2
2. Correct statement with respect to magnetic field in the given diagram is, (Preparatory – 1)
(C → Current-carrying solenoid, P and Q → Points inside the solenoid,R→ Point outside the solenoid)
The magnetic field
(A) in P is more than in Q
(B) in Q is more than in P
(C) in R is more than in P and in O
(D) in P and in Q is equal.
ONE MARK QUESTIONS
1. Observe the below figure. When switch is closed, does the B end of the solenoid attract the N end of the bar magnet? Clarify the answer (MQP –1)
2. List any two suggestions to avoid the overload in domestic electric circuit. (MQP –2)
3. What happens if the fuse is connected to the neutral wire instead of connecting to the live wire in the meter board of the house? (MQP –3)
4. What are the reasons for overload in an electric circuit?
5. Two situations of freely suspended parallel copper wires carrying current are shown in the figure given below. (MQP –4)
In which of these situations, the wires attract each other? Justify your answer
6. What does the thumb indicate in the right-hand thumb rule? (Preparatory – 2)
TWO MARKS QUESTIONS
1. What precautionary measures have to be taken to avoid overload in domestic circuit? (MQP –1)
2. One end of the bar magnet is brought near the south pole of a magnetic needle. Then this end of the magnetic needle deflects away from the end of the bar magnet. Name the pole of the bar magnet that has been directed towards the south pole of this magnetic needle. Give reason for your answer. (MQP –3)
3. Draw the diagram indicating the field lines of the magnetic field around a current-carrying straight conductor. (MQP –4)
4. Mention any four properties of magnetic field lines. (Preparatory – 1)
OR
What precautionary measures have to be taken to avoid overload in domestic electric circuit?
5. Write any two methods of increasing the magnetic field produced by a circular coil carrying electric current. (Preparatory – 2)
THREE MARKS QUESTIONS
1. Explain an activity of obtaining magnetic field lines around a bar magnet using a compass needle.
OR
Explain experiment that shows ‘a current carrying conductor when kept in the magnetic field experiences a mechanical force. (MQP –1)
2. a) What is solenoid? (MQP –2)
b) State Fleming’s left hand rule.
c) What is the potential difference between live wire and neutral wire in domestic electric circuit in our country?
3. a) What are the reasons for overloading in an electric circuit? (MQP –3)
b) What is solenoid? How can electromagnet be prepared from a solenoid?
OR
a) Mention the properties of magnetic field lines.
b) When the number of turns of a current carrying circular loop is increased by ten times what change occurs in the magnetic field produced in it?
4. Explain an experiment to demonstrate that a current carrying conductor placed in a magnetic field experiences a force. (MQP –4)
OR
Explain an activity to draw the magnetic field lines around a bar magnet using a compass needle.
5. Explain the activity of drawing magnetic field lines around a bar magnet using a compass needle. (Preparatory – 1)
6. A transparent glass sheet is placed over a bar magnet. Iron filings sprinkled over the glass sheet. The glass sheet is given a gentle tap and following observations are made. (Preparatory – 2)
a) Iron filings form non-parallel curved lines.
b) Iron filings are closely packed near the poles.
c) As moved away from the bar magnet, the distribution of the iron filings become rarer. Which property of the bar magnet does each of the above observations indicate?
OR
The given diagram represents the experiment conducted to observe the deviation of a beam of electrons when the beam enters the magnetic field perpendicularly. If the beam deviates in the direction out of the surface of the paper then
i) predict the pole of the magnet indicated as A
ii) state the principle that helps this prediction.
LIGHT – REFLECTION AND REFRACTION
MULTIPLE CHOICE QUESTIONS
1. The reciprocal of focal length of lens is (MQP –1)
(A) the power of lens
(B) the radius of curvature of lens
(C) equal to the sum of object distance and image distance
(D) equal to the difference between the object distance and image distance
2. A mirror produces erect and enlarged image of an object. Then the type of mirror and the nature of that image is respectively (MQP –3)
(A) Convex mirror and virtual image
(B) concave mirror and real image
(C) Convex mirror and real image
(D) Concave mirror and virtual image
3. The diameter of the reflecting surface of a spherical mirror is (MQP –4)
(A) pole of the mirror
(B) centre of curvature
(C) principal axis
(D) aperture
4. The distance between principal focus and the optic centre of the lens is (Preparatory - 2)
(A) Radius of curvature
(B) Object distance
(C) Focal length
(D) Image distance
ONE MARK QUESTIONS
1. Which mirror is used as rear view mirror? (MQP –2)
2. In the given diagram, which angle is bigger among the angles r1, and r2? Give a reason. (Preparatory - 1)
THREE MARKS QUESTIONS
1. Draw a ray diagram to show the image formation when an object is kept beyond ‘C’ in front of a concave mirror. Mention the nature and position of the image formed. [C: Centre of curvature of mirror] (MQP –1)
2. a) State two laws of reflection of light. (MQP –2)
b) What is magnification of mirror? What does the negative sign indicate in the magnification value?
OR
Explain the activity which shows the refraction of light through a glass slab.
3. Draw the diagram to show the image formation when an object is placed between 2F1 and F1 of a convex lens. Mention the position and size of the image formed. (F1 -principal focus of lens) (MQP –3)
4. Draw the ray diagram to show the image formation when an object is kept between ‘C’ and ‘F’ of a concave mirror. Write the nature and size of the image formed. [C = Centre of curvature, F = Principal Focus] (MQP –4)
5. Draw the ray diagram for the image formation when an object is placed between 2F1 and F1 of a convex lens. Mention the nature of the image formed. [ F1 : Principal focus of the lens. ](Preparatory – 1)
6. Draw the ray diagram of the image formed when an object is placed at F1 in front of a convex lens. Mention the position and size of the image. (Preparatory – 1)
FOUR MARKS QUESTIONS
1. a) State the laws of refraction of light. (MQP –1)
b) Mention any two differences between convex mirror and convex lens.
2. a) An object is placed perpendicular to principal axis of a convex lens of focal length 20cm. If the distance of image is to be 60cm, then at what distance the object is to be placed from the lens?
b) The object distance and image distance of a lens are -30cm and -10 cm respectively. Decide the type of lens and nature of image. (MQP –2)
3. a) What is reflection of light? (MQP –3)
b) State the laws of reflection of light.
c) What is the focal length of a mirror?
OR
a) What is refraction of light?
b) State Snell’s law of refraction.
c) Define the following with respect to a lens. i) Focal point ii) Aperture
4. a) What is magnification? Write the formula to calculate magnification of the image produced by a lens.
b) State the laws of reflection of light. (MQP –4)
5. a) What is magnification? If the magnification of an image produced by a lens is + 2, then mention the type of the lens. b) The refractive index of medium A is less than that of medium B. Which of these media is optically denser? In which of these media the speed of light is more? (Preparatory – 1)
OR
a) What is centre of curvature of a spherical mirror ? Write any two uses of concave mirror.
b) State the laws of refraction of light.
6. a) What is magnification? If the magnification of the image produced by a lens is + 2, then mention the type of the lens. b) Refractive index of medium A is lesser than the refractive index of medium B. Which of these two media is optically denser ? In which medium speed of light is more? (Preparatory – 2)
OR
a) State two laws of reflection of light.
b) Write any two differences between concave mirror and convex mirror.
HUMAN EYE AND COLOURFUL WORLD
TWO MARKS QUESTIONS
1. Observe the figure given below. Name the angle of deviation and identify its value. (MQP –1)
2. Draw a diagram of experiment conducted by Newton to show the recombination of white light. (MQP –2)
3. Define the phenomenon expressed in below given figure. Which colour does H and M represent here? (MQP –3)
4. What is the colour of danger signal lights? Why is that colour preferred? (MQP –4)
5. Observe the below given diagram of the human eye. Name the eye defect indicated in this diagram and mention the lens used to correct this defect. (Preparatory – 1)
a) What is the colour of the ray of light indicated as A ?
b) Predict the colour of the ray of light indicated as B. Justify your answer.
THREE MARKS QUESTIONS
1. a) Mention any two symptoms of myopic eye. How can this defect be rectified? (MQP –1)
b) What is power of accommodation of eye?
2. a) What is near-sightedness? (MQP –2)
b) What is power of accommodation of eye? How does the eye accommodate to see distant objects?
OR
Stars appear to twinkle but the planets do not twinkle. Why?
3. What is presbyopia? Mention the reasons and suggest a remedy for this defect? (MQP –3)
OR
What is short-sightedness? What are the reasons for this defect? How can it be corrected?
4. a) A student clearly reads letters of a textbook only when the book is kept at a distance more than 50cm from his eyes without difficulty. Then, (MQP –4)
i) identify this defect of the eye.
ii) suggest a remedy for this defect.
b) When sunlight passes through the trees of a dense forest on a foggy morning then the path of the beam of light appears between the trees.
i) What is this phenomenon called?
ii) The same phenomenon is not normally visible in an open field. Why? Write your analysis.
OR
a) The position of the stars changes apparently in the clear sky. Why? Explain.
b) White light is passed through the given arrangement of three glass prisms (X, Y, and Z) as shown in the figure given below.
i) Is spectrum of light seen on the screen?
ii) What is the role of prism Z
5. Explain the phenomenon of formation of the rainbow in the atmosphere. (Preparatory – 1)
OR
Explain Newton’s experiment that shows the recombination of spectrum of white light.
6. What is myopia (near sightedness ) ? What are the causes for myopia ? Name the type of the lens used to correct myopia. (Preparatory – 2)
OR
a) What is the Tyndall effect ? Which property of the scattering particles decides the colour of the scattered light ?
b) What is the colour of danger signal lights ?
CLICK BELLOW TO JOIN/FOLLOW👇
No comments:
Post a Comment