1 12345678910111213141516171819202122232425 CBSE Class X – Science Physics Exam (Full Syllabus) This test is designed based on NCERT Syllabus for Class 10 Topics of Science – Physics Each time random 25 questions will be displaced from the question bank of 500 + Questions So we recommend you to retake the quiz till you have mastered all the questions 1 / 25 Magnetic effect of current was identified by: Oersted Faraday Bohr Ampere Oersted showed that electricity and magnetism were related phenomena. Oersted showed that electricity and magnetism were related phenomena. 2 / 25 The nature of magnetic field line passing through the centre of current carrying circular loop is: circular ellipse parabolic straight line magnetic field line at the centre of current carrying loop appears as a straight line. magnetic field line at the centre of current carrying loop appears as a straight line. 3 / 25 A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference: more in (i) than in (ii) case more in (ii) than in (i) case same in both can’t say When magnet is moved quickly, more will be the changing magnetic field strength and hence larger is the induced potential difference. When magnet is moved quickly, more will be the changing magnetic field strength and hence larger is the induced potential difference. 4 / 25 when an iron core is inserted into a current carrying solenoid strength of the magnetic field produced inside the solenoid remains unchanged strength of the magnetic field produced inside the solenoid decreases strength of the magnetic field produced inside the solenoid increases no effect 5 / 25 The commercial motors use a soft iron core on which the coil is wound because to increase the power of the electric motor to decrease the power of the electric motor to reduce the power of the electric motor. none 6 / 25 Commercial electric motors do not use A permanent magnet to rotate the armature Effectively large number of turns of conducting wire in the current carrying coil. A soft iron core on which the coil is wound An electromagnet to rotate the armature 7 / 25 The magnetic feld inside a long straight solenoid carrying current is zero same at all points uneven none of these 8 / 25 You are holding the current-carrying wire in your right hand so that your thumb points in the direction of current, then the direction in which your fingers encircle the wire will give the direction of the magnetic feld lines around the wire.explain Maxwell’s left hand thumb rule Maxwell’s right hand thumb rule fleming right hand rule fleming left hand rule 9 / 25 A battery of 10 volt carries 20,000 C of charge through a resistance of 20 Ω. The work done in 10 seconds is: 2 × 103 joule 2 × 105joule 2 × 104 joule 2 × 102 joule W= qV= 20000 × 10 = 2,00, 000 = 2 × 105 J W= qV= 20000 × 10 = 2,00, 000 = 2 × 105 J 10 / 25 A cell, a resistor, a key, and an ammeter are arranged as shown in the circuit diagrams. The current recorded in the ammeter will be: maximum in (i) maximum in (ii) maximum in (iii) same in all the cases Ammeter at the times connected in series with in the circuit. The reading is independent from its location. Ammeter at the times connected in series with in the circuit. The reading is independent from its location. 11 / 25 A student drives out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 R2 and R3 respectively. Which of the following is huge? R1 = R2 = R3 R1 > R2 > R3 R3 > R2 > R1 R2 > R3 > R1 Current is inversely proportional to the resistance for the same potential. So higher resistance would allow less current to pass through its which is shown by R3 as I3 < I2 < I1∴ R3 >R2 > R1 Current is inversely proportional to the resistance for the same potential. So higher resistance would allow less current to pass through its which is shown by R3 as I3 < I2 < I1∴ R3 >R2 > R1 12 / 25 The resistivity does not change if: the material is changed the temperature is changed the shape of the resistor is changed both material and temperature are changed The resistivity does not change if the shape of resistor is changed because nature of material will remain same. The resistivity does not change if the shape of resistor is changed because nature of material will remain same. 13 / 25 Copper is not approved to make fuse wire because it: is a good conductor of electricity has a low melting point has a high melting point is not easily available Copper wire cannot be used as a fuse wire since melting point of Cu is higher and resistance is very low and current can flow through it without melting it and without breaking the circuit resulting in appliance damage Copper wire cannot be used as a fuse wire since melting point of Cu is higher and resistance is very low and current can flow through it without melting it and without breaking the circuit resulting in appliance damage 14 / 25 S.I unit of resistance ohm mho ohm metre none 15 / 25 At the time of short circuit, the electric current in the circuit vary continuously does not change reduces substantially increases heavily 16 / 25 When a 4 V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. The value of the resistance of the resister is 4 Ohm 40 Ohm 400 Ohm 0.4 Ohm 17 / 25 An ideal ammeter is one which has infinite resistance zero resistance finite resistance no resistance 18 / 25 Arpit remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed ,What is the total time diference on duration of day on earth? 4 minutes 6minutes 8minutes 10minutes 2 minutes (due to advanced sunrise) + 2 minutes (due to delayed sunset) 2 minutes (due to advanced sunrise) + 2 minutes (due to delayed sunset) 19 / 25 Power of a lens is 1/f 1/T 1/fT none 20 / 25 The sky appears black to an astronaut Because there is no refraction Because there is no reflection Because there is no scattering light none 21 / 25 The defect the eye cannot focus objects both horizontally and vertically at the same time Far – sightedness Myopia Astigmatism none 22 / 25 Myopia can be corrected by using convex lens concave lenses both concave and convex none 23 / 25 A concave lens of short focal length has greater Converging power than concave lens of long focal length diverging power than convex lens of long focal length diverging power than concave lens of long focal length converging power than convex lens of long focal length 24 / 25 The emergent ray in a prism bend at an angle to the direction of the incident ray refracting ray reflecting ray none 25 / 25 The refractive index of glass is largest for violet color red color blue color white color Your score is 0% Restart quiz