CBSE PHYSICS: MCQ-Physics Class X Magnetic effects of currents

Multiple Choice Questions : Physics Class X

MAGNETIC EFFECTS OF ELECTRIC CURRENT

1.A magnetic field can exert force on

(a)a moving magnet (b) stationary magnet (c) moving charge (d)all of these

2.Magnetic lines of force

(a)have more directions (b)have no physical reality

(c)can be used to indicate the direction of the magnetic field of a point

(d)all the above

3. When is the back emf of an electric motor the greatest?

(a)when the motor is witched on

(b)when the motor is speeding up

(c)when the motor is at maximum speed

(d)when the motor is slowing down

4.According to international convention of color coding in a wire

(a)live is red, neutral is black and earth is green

(b) live is brown, neutral is blue and earth is green

(d)live is red, neutral is yellow and earth is blue

5.An electric current can be produced in a closed loop

(a)by connecting it to a battery, but not by moving a magnet near it

(b)by moving a magnet near it, but not by connecting it to a battery

(c)by connecting it to a battery, as well as by moving a magnet near it

(d)neither by connecting it to battery nor by moving a magnet near it

6.Which of the following describes the common domestic power supplied in India?

(a)220V,100Hz (b)110V,100Hz

7.Magnetic field due to a current carrying straight wire depends on

(a)current only (b)distance from the wire only

8.The direction of the magnetic field produced by a current carrying straight conductor can be found using

(a)right hand thumb rule (b)right hand Fleming’s rule

(c)left hand Fleming’s rule (d)right hand screw rule

9.A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

(a)two revolution (b)one revolution (c)half revolution (d)one-forth revolution

10.Electric motor

(a)is based on electromagnetic induction (b)converts kinetic energy into electrical energy

(c)converts electric energy into kinetic energy (d)none

11.To convert ac generator into dc generator

(a)split ring type commentator must be used (b)slip rings and brushes must be used

(c)a stronger magnetic field has to be used (d)a rectangular wire loop has to be used

12.Choose the incorrect statement

(a)The direction of magnetic field at a point is taken to be the direction in which north pole of magnetic compass needle points

(b)magnetic field lines are closed curves

(c)If magnetic field lines are parallel and equi distant, they represent zero field strength

(d)relative strength of magnetic field is shown by the degree of closeness of the field lines.

13.Force on a current conductor in a magnetic field depends on

(a)length of the conductor (b)current in the conductor

(c)magnitude of the magnetic field (d)all of these

14.Magnetic field inside a solenoid is

(a)non-uniform (b)circular

(c)uniform (d)none

15.Magnetic field lines due to a bar magnet is similar to that of a

(a)current carrying straight wire (b) solenoid (c) two parallel wires (d)none

Comments

CBSE ADDA :By Jsunil Sir : Your Ultimate Destination for CBSE Exam Preparation and Academic Insights

Living science ratna sagar class 6 solutions

Ratna sagar living science 6 answers by jsunil. Class6 Living science solution Term-1 Living Science Solution chapter-1 Source of food Download File Living Science Solution chapter-2 Component of food Download File Living Science Solution chapter-3 Fibre to fabric Download File Living Science Sol ch-4 Sorting of material into group Download File Living Science Soln ch-5 Separation of substance Download File Living Science Solution chapter-6 Change around Us Download File Living Science Solution ch-7 Living and Non Living Download File Living Science Solution ch-8 Getting to Know Plants Download File Living Science Sol ch-9 The Body and Its movements Download File Visit given link for full answer Class6 Living science solution Term-II

Class 10 Chapter 02 Acid Bases and Salts NCERT Activity Explanation

NCERT Activity Chapter 02 Acid Bases and Salt Class 10 Chemistry Activity 2.1 Indicator Acid Base Red litmus No Change Blue Blue Litmus Red No change Phenolphthalein Colourless Pink Methyl Orange Pink Yellow Indictors are substance which change colour in acidic or basic media. Activity 2.2 There are some substances whose odour changes in in acidic or basic media. These are called olfactory indicators. Like onion vanilla, onion and clove. These changes smell in basic solution. Activity 2.3 Take about 5 mL of dilute sulphuric acid in a test tube and add few pieces of zinc granules to it. => You will observe bubbles of hydrogen gas on the surface of zinc granules. Zn + H2SO4 --> ZnSO4 + H2 => Pass the Hydrogen gas through the soap solution. Bubbles formed in the soap solution as Hydrogen gas it does not get d...

Class 10 Metal and Non MetalsChapter 03 NCERT Activity Solutions

X Class 10 NCERT Activity Explanation Class 10 Metals and Non Metals Activity 3.1 Page No. 37 Take samples of iron, copper, aluminium and magnesium. Note the appearance of each sample. They have a shining surface. Clean the surface of each sample by rubbing them with sand paper and note their appearance again. They become more shiny. => Freshly cut Metal have shiny surface Activity 3.2 Page No. 37 Take small pieces of iron, copper, aluminium, and magnesium. Try to cut these metals with a sharp knife and note your observations. They are very hard to cut. Hold a piece of sodium metal with a pair of tongs and try to cut it with a knife. Sodium can be cut easily with knife. Hence K and Na are soft metal cut with knife Activity 3.3 Page No. 38 Take pieces of iron, zinc, lead and copper try to strike it four or five times with a hammer. These metals are beaten into thin sheet on hammering. This property of metal is called malleability and metals are called malleable. Activity 3.4 Page ...

Class 09 Atoms and Molecules Numerical Problem based on Law of chemical Combination(Solved)

Class 09 Atoms and Molecules Numerical Problem based on Law of chemical Combination Law of conservation of mass Law of constant proportion Empirical formula 1. If 10 grams of CaCO 3 on heating gave 4.4g of CO 2 and 5.6g of CaO, show that these observations are in agreement with the law of conservation of mass.(Based on Law of conservation of mass) Solution: Mass of the reactants = 10g ; Mass of the products = 4.4 + 6.6g = 10g Since the mass of the reactants is equal to the mass of the products, the observations are in agreement with the law of conservation of mass. 2. 1.375 g of cupric oxide was reduced by heating and the weight of copper that remained was 1.098g. In another experiment 1.179 g of copper was dissolved in nitric acid and the resulting copper nitrate was converted into cupric oxide by ignition . The weight of cupric oxide formed was 1.476 g. which law of chemical combinations does this data state? Solution: in first experiment: Copper oxide = 1....

CBSE I NCERT 10th Numerical Problem solved Reflection and reflection of light

Q. 1. A concave mirror of focal length 20cm is placed 50 cm from a wall. How far from the wall an object be placed to form its real image on the wall? Solution: V= -50 cm F= -20cm From mirror formula 1/u = 1/f – 1/v = -1/20+ 1/50 = - 3/100 U = - 33.3 cm Therefore, the distance of the object from the wall x = 50 – u X = 50 – 33.3 = 16.7 cm. Q.2. An object is placed at a distance of 40cm from a concave mirror of focal length 15cm. If the object is displaced through a distance of 20 cm towards the mirror, By how much distance is the image displaced? Answer: Here f = - 15 cm, u = - 40 cm Now 1/f = 1/u + 1/v Then 1/v = 1/f – 1/u Or V= uf/u-f =( - 40 x -15)/25 = -24 cm Then object is displaced towards the mirror let u1 be the distance object from the Mirror in its new position. Then u1 = -(40-20) = -20cm If the image is formed at a distance u1 from the mirror then v1 = u1f/u1-f = -20X-15/-20+15 = -60 cm. = - 20 x-15/-20+15 = -60 ...

CBSE ADDA

Search This Blog