DIAGRAM BASED QUESTIONS
PHYSICS
Magnetic Effect Of Electric Current
Q1. 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.
Ans:
★ No / Repel
★ When the switch is closed, the B end of the solenoid behaves like the N pole. Hence the homogeneous poles repel it.
Q2. Observe the figure given below. The magnetic field at the centre ‘C’ of circular coil is
(A) zero
(B) I
(C) I1
(D) I2
Ans: (A) zero
Q3. Two situations of freely suspended parallel copper wires carrying current are shown in the figure given below.
In which of these situations, the wires attract each other? Justify your answer.
Ans:
★ Situation – 1
★Parallel wires carrying currents in the same direction attract each other. Therefore, in this situation, the two wires attract each other.
Q4. Correct statement with respect to magnetic field in the given diagram is,
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.
Ans: (D) in P and in Q is equal.
Q5. 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.
Ans:
★ A is the North Pole.
★ stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. Forefinger points in the direction of magnetic field and middle finger in the direction of current, then the thumb will point in the direction of motion.
Q6. Observe the given schematic diagram. What is the direction of force acting on the electron ? Justify your conclusion.
Ans:
★ Into the paper
★ According to Fleming’s Left-Hand Rule
★ current opposite to electron flow.
Q7. Observe the circuit diagram given below. Answer the questions given.
ii) Mention the direction of magnetic field that forms around at the points 'X' and 'Y.
ii) State the rule that helps to decide the direction of magnetic field.
Ans:
i)
★ X → Anticlockwise
★ Y → Clockwise
ii) The right hand thumb rule states that if we hold a straight current carrying conductor with our right hand such that the thumb points in the direction of the current, then the curled fingers indicate the direction of the magnetic field lines.
Q8. Observe the diagram.
The magnetic poles represented by P and Q respectively are (Sep - 2020)
(A) south ( ) and south (S)
(B) north ( N ) and south ( S )
(C) north (N) and north (N)
(D) south (S) and north (N)
Ans. : (A) south (S) and south (S)
Q9. Observe the figure and mention the direction of the force acting on the current carrying conductor AB. Name the rule that helped you to find the direction of the force.
Ans. :
★ Towards left / Towards the magnet ( Or towards north pole of the magnet )
★ Fleming’s left hand rule
Q10. Observe the circuit diagram given below. Mention the direction of magnetic field that forms around the point P and around the point Q
Ans. :
★ Anticlockwise at the point P.
★ Clockwise at the point Q.
Q11. Observe the given figures and answer the questions that follow :
i) Which of the above figures shows the correct direction of magnetic field ?
ii) Name and state the rule that helped to choose the correct figure.
Ans. :
i) Figure (b) shows the correct direction of magnetic field.
ii) Right hand thumb rule helps to choose the correct figure.
Q12. Observe the given diagram and answer the questions given below:
i) Value Points Mention the direction of electric current flowing in the conductor.
ii) Total State the law that helped to determine the direction of current.
Ans:
★ Electric current is flowing towards the X end of the straight conductor. OR Electric current is flowing from bottom to top of the straight conductor.
Right Hand Thumb Rule :
Imagine that you are holding a current-carrying straight conductor in your right hand such that the thumb points towards the direction of current ; then your fingers will wrap around the conductor in the direction of the field lines of the magnetic field.
Q13.
(a) What happens to the rod AB when the key K is closed and why?
(b) Name and state the rule that determines this behaviour of the rod AB in the above situation.
Ans:
(a) The rod AB gets displaced from its original position because it experiences a force when placed in external magnetic field.
(b) Fleming's Left Hand Rule.
Stretch the thumb, fore finger and middle finger of your left hand such that they are mutually perpendicular. If forefinger points in the direction of magnetic field, second finger in the direction of current, then the thumb will point in the direction of motion or force acting on the conductor.
Q14. The pattern of magnetic field due to a current carrying wire depends upon the shape made by that wire. Justify.
Ans:
★ Magnetic field pattern for a current carrying straight conductor - concentric circles.
★ Magnetic field pattern for a current carrying solenoid - magnetic field lines similar to that of a bar magnet.
★ Magnetic field pattern for a current carrying circular loop - a pair of concentric circles with parallel straight lines at the centre.
Q15. The diagram given below shows an electron moving in a uniform magnetic field:
(I) What will be the direction of the force acting on the electron?
(II) What will happen to the direction of the force acting on the electron, if the direction of the magnetic field as well as the direction of motion of the electron, both are reversed?
Ans:
(I) Into the plane of paper.
(II) The direction of force will remain the same.
Human Eye And Colourful World
Q1. Observe the figure given below. Name the angle of deviation and identify its value.
Ans:
★ the angle of deviation is angle HGF
★ it's value is 38^o
Q2. Define the phenomenon expressed in below given figure. Which colour does H and M represent here?
Ans:
★ Phenomenon: Dispersion of light
★ H represents Red
★ M represents Blue
Q3. 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?
Ans:
i) Yes / The spectrum of light forms on the screen
ii) Prism Z disperses this white light into 7 colours and hence we see the spectrum of light on the screen.
Q4. In the given diagram, which angle is bigger among the angles r1, and r2? Give a reason.
Ans:
★ Angle r2 is larger.
★ Because light speeds up and bends away from the normal line when exiting the glass into the air.
Q5. 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.
Ans:
★ Myopia / Near sightedness
★ Concave lens
Q6. Observe the given diagram and answer the following questions:
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.
Ans:
★ A - Green, B - Green
★ There will be no dispersion
Q7. Observe the following figure. Answer the question given below :
Whether this phenomenon can be observed on the moon surface? Justify the answer.
Ans:
★ No,
★ Since there is no liquid water or rain on the Moon's surface,
Q8. Observe the figure given below. Name the defect of the eye depicted in the figure. What causes this defect? How can this defect be corrected?
Ans:
★ Hypermetropia
Causes:
★ The focal length of the eye lens is too long
★ The eyeball has become too short
Correction:
★ convex lens
Q9. Identify the emergent ray in the given figure.
A) CD
(B) BC
(C) AB
(D) IJ
Ans. : (A) CD
Q10. In the given figure, AB is the incident ray, BC is the refracted ray and MN is the normal at the point of incidence. Which medium is more denser ? Why ?
Ans:
★ Medium 1 is more denser.
★ When a ray of light travels from rarer medium to denser medium, it always bends towards the normal.
Q11. Observe the diagrams given below :
The correct conclusion that you can draw here is that, the angle of deviation will be
(A) maximum in Q
(B) minimum in P
(C) more in P than in Q
(D) more in R than in Q
Ans. : (A) maximum in Q
Q12. Observe the below figure showing the refraction of light through a glass prism
Ans:
★ The angle represented as ∠x is called the Angle of Deviation.
★ formed due to the bending of light inside the prism.
Q13. Glass prisms A, B and C are arranged as shown in the figure given below. When a ray of white light is passed through prism A, does the spectrum of light form on the screen ? Give reason.
Ans. :
★ Yes / The spectrum of light forms on the screen.
★ Prism A disperses the white light into 7 colurs, Prism B recombines the 7 colours of the spectrum to form the white light and Prism C disperses this white light into 7 colours and hence we see the spectrum of light on the screen.
Q14. A person who has a defect of the eye as shown in the below figure purchases a spectacle having lens of – 2·0D power. Is this lens suitable to rectify the eye defect of that person ? Analyse.
Ans. :
★ This lens is not suitable for that person’s defect of eye.
★ Light rays from a closeby object are focussed at a point behind the retina.
★ Therefore it is farsightedness and it is corrected by using a convex lens of appropriate power in spectacle.
★ Lens of – 2·0 D power is a concave lens and that does not rectify this defect.
Q17. Observe the given incomplete diagram.
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