Assertion and Reason -physics class 10 Welcome to your Assertion and Reason -physics class 10 1. Assertion(A): On changing the direction of flow of current through a straight conductor, the direction of a magnetic field around the conductor is reversed.Reason (R) : The direction of magnetic field around a conductor can be given in accordance with left hand thumb rule. A is false but R is true. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is false. None 2. Assertion(A): The magnitude of the magnetic field at a point on the axis of a current carrying solenoid is inversely proportional to the current flowing through the solenoid.Reason (R) : The magnitude of the magnetic field at a point on the axis of a current carrying solenoid is directly proportional to the number of turns per unit length of a solenoid. A is true but R is false. Both A and R are true and R is the correct explanation of A. A is false but R is true. Both A and R are true but R is not the correct explanation of A. None 3. Assertion(A): A normal human eye can clearly see all the objects beyond certain minimum distance.Reason (R) : The human eye has capacity of adjusting the focal length of eye lens. A is false but R is true. A is true but R is false. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. None 4. Assertion(A) : When the object moves with a velocity 2 m/s, its image in the plane mirror moves with a velocity of 4 m/s.Reason (R) : The image formed by a plane mirror is as far behind the mirror as the object is in front of it. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is false but R is true. A is true but R is false. None 5. Assertion (A) : A cell is a device which converts chemical energy into electrical energy.Reason (R) : Cell maintains a constant potential difference between its terminals for a long time. Both A and R are true and R is the correct explanation of A. A is true but R is false. Both A and R are true but R is not the correct explanation of A. A is false but R is true. None 6. Assertion (A) : Alloys are commonly used in electrical heating devices, like electrical iron,toasters etc.Reason (R) : Alloys do not oxidise (burn) readily at high temperatures. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is false. A is false but R is true. None 7. Assertion (A) : When the resistances are connected between the same two points, they are saidto be connected in parallel.Reason (R) : In case the total resistance is to be decreased, then the individual resistances are connected in parallel. A is false but R is true. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is false. None 8. Assertion (A) : If a graph is plotted between the potential difference and the current flowing,the graph is a straight line passing through the origin.Reason (R) : The current is directly proportional to the potential difference. A is true but R is false. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is false but R is true. None 9. Assertion(A) : Concave mirrors are used as make-up mirrors.Reason (R) : When the face is held within the focus of a concave mirror, then a diminished image of the face is seen in the concave mirror. A is true but R is false. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is false but R is true. None 10. Assertion(A) : The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the radius of the circular coil.Reason (R) : Magnetic field strength is inversely proportional to the radius of the circular coil. Both A and R are true and R is the correct explanation of A. A is true but R is false. A is false but R is true. Both A and R are true but R is not the correct explanation of A. None 11. Assertion(A): A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of an electric current in the wire is increased.Reason (R) : Strength of a magnetic field at a point near the conductor increases on increasing the current. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is false. A is false but R is true. None 12. Assertion(A) : A ray of light travelling from a rarer medium to a denser medium slows down and bends away from the normal. When it travels from a denser medium to a rarer medium, it speeds up and bends towards the normal.Reason (R) : The speed of light is higher in a rarer medium than a denser medium. Both A and R are true but R is not the correct explanation of A. A is false but R is true. A is true but R is false. Both A and R are true and R is the correct explanation of A. None 13. Assertion(A): The Sun appears flattened at sunrise and sunset.Reason (R) : The apparent flattering of the Sun’s disc at sunrise and sunset is due to atmospheric refraction. Both A and R are true and R is the correct explanation of A. A is false but R is true. Both A and R are true but R is not the correct explanation of A. A is true but R is false. None 14. Assertion(A) : A rainbow is sometimes seen in the sky in rainy season only when observer’s back is towards the Sun.Reason (R) : Internal reflection in the water droplets cause dispersion and the final rays are in backward direction. Both A and R are true but R is not the A is true but R is false. Both A and R are true and R is the correct explanation of A. A is false but R is true. None 15. Assertion(A) : The centre of curvature is not a part of the mirror. It lies outside its reflecting surface.Reason (R) : The reflecting surface of a spherical mirror forms a part of a sphere. This sphere has a centre. A is true but R is false. Both A and R are true but R is not the correct explanation of A. A is false but R is true. Both A and R are true and R is the correct explanation of A. None 16. Assertion(A) : The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the current flowing through the coil.Reason (R) : Magnetic field strength is inversely proportional to the current flowing in the coil. Both A and R are true and R is the correct explanation of A. A is true but R is false. A is false but R is true. Both A and R are true but R is not the correct explanation of A. None 17. Assertion(A) : The emergent ray is parallel to the direction of the incident ray.Reason (R) : The extent of bending of the ray of light at the opposite parallel faces (air- glass interface and glass-air interface) of the rectangular glass slab is equal and opposite. Both A and R are true but R is not the correct explanation of A. Both A and R are true and R is the correct explanation of A. A is true but R is false. A is false but R is true. None 18. Assertion(A) : The phenomenon of scattering of light by the colloidal particles gives rise to Tyndall effect.Reason (R): The colour of the scattered light depends on the size of the scattering particles. Both A and R are true but R is not the correct explanation of A. Both A and R are true and R is the correct explanation of A. A is false but R is true. A is true but R is false. None 19. Assertion (A) : Longer wires have greater resistance and the smaller wires have lesser resistance.Reason (R) : Resistance is inversely proportional to the length of the wire. Both A and R are true but R is not the correct explanation of A. A is false but R is true. A is true but R is false. Both A and R are true and R is the correct explanation of A. None 20. Assertion(A): Hypermetropia is the defect of the eye in which only farther objects are seen.Reason (R) : Hypermetropia is corrected by using converging lens. A is true but R is false. A is false but R is true. Both A and R are true but R is not the correct explanation of A. Both A and R are true and R is the correct explanation of A. None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
