Samacheer Kalvi EM 12 Physics Vol1 Unit2 MCQs Mock Test

12th Physics - Volume 1 Mock Test

Unit 2: Current Electricity

Choose the correct answer from the multiple choices, then click "Next" to goto next question and finally click "OK" after seeing the score.

 

1. The following graph shows current versus voltage values of some unknown conductor. What is the resistance of this conductor?
   
   
   1.   2 ohm
   2.   4 ohm
   3.   8 ohm
   4.   1 ohm
2. A wire of resistance 2 ohms per meter is bent to form a circle of radius 1 m. The equivalent resistance between its two diametrically opposite points, A and B as shown in the figure is-
   
   
   1.   π Ω
   2.   π/2 Ω
   3.   2π Ω
   4.   π/4 Ω
3. A toaster operating at 240 V has a resistance of 120 Ω. The power is
   1.   400 W
   2.   2 W
   3.   480 W
   4.   240 W
4. A carbon resistor of (47 ± 4.7) k Ω to be marked with rings of different colours for its identification. The colour code sequence will be
   1.   Yellow – Green – Violet – Gold
   2.   Yellow – Violet – Orange – Silver
   3.   Violet – Yellow – Orange – Silver
   4.   Green – Orange – Violet – Gold
5. What is the value of resistance of the following resistor?
   
   
   1.   100 k Ω
   2.   10 k Ω M
   3.   1 k Ω
   4.   1000 k Ω
6. Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose R_A=3 R_B, then what is the ratio of radius of wire A to that of B?
   1.   3
   2.   √3
   3.   1/√3
   4.   1/3
7. A wire connected to a power supply of 230 V has power dissipation P₁ Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P2. The ratio p2/p1 is.
   1.   1
   2.   2
   3.   3
   4.   4
8. In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60W bulb for use in India is R, the resistance of a 60W bulb for use in USA will be
   1.   R
   2.   2R
   3.   R/4
   4.   R/2
9. In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1kW are connected. The voltage of electric mains is 220 V. The minimum capacity of the main fuse of the building will be (IIT-JEE 2014)
   1.   14 A
   2.   8 A
   3.   10 A
   4.   12 A
10. There is a current of 1.0 A in the circuit shown below. What is the resistance of P?
    
    
    1.   1.5 Ω
    2.   2.5 Ω
    3.   3.5 Ω
    4.   4.5 Ω
11. What is the current out of the battery?
    
    
    1.   1 A
    2.   2 A
    3.   3 A
    4.   4 A
12. The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 Ω. The resistance of the wire will be 2 Ω. at
    1.   1154 K
    2.   1100 K
    3.   1400 K
    4.   1127 K
13. The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10Ω is
    1.   0.2 Ω
    2.   0.5 Ω
    3.   0.8 Ω
    4.   1.0 Ω
14. A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of
    1.   each of them increases
    2.   each of them decreases
    3.   copper increases and germanium decreases
    4.   copper decreases and germanium increases
15. In Joule’s heating law, when I and t are constant, if the H is taken along the y axis and `I^2` along the x axis, the graph is
    1.   straight line
    2.   parabola
    3.   circle
    4.   ellipse

Samacheer Kalvi EM 12th Std Physics Vol1 Unit 2 MCQs Mock Test Instructions

Unit 2: Current Electricity

Here you will find 15 MCQs questions and options. Read the questions carefully and select the appropriate answer for the question by selecting/clicking the box before the option. A pop-up box will open by displaying the result of the option selected. The result of each question will be based on percentages. Each question will have 3 chances to select the right option and for every chance, the percentage of scores will be reduced. Likewise, the remaining questions also take place. The overall percentage scored will be displayed at the completion of the mock test.

Note: Every time the page loads, the question and options will be randomized and takes you to the beginning of the particular exercise.

Button Navigations:

The Below Image shows the button navigations.

• The Home Button On the Top and Bottom Navigates to the Homepage of the Subject (Example: To Physics if the mock test is taken from Physics).
• The Next Unit Button on the Top and Bottom Navigates to the Next Unit (Example: From Unit 2 to Unit 3 and so on).
• The Prev Unit Button on the Top and Bottom Navigates to the Previous Unit of the subject (Example: From Unit 2 to Unit 1 and so on).
• The Next Button next to the question numbers Navigates to the Next Question (Example: From 1 to 2 and so on).
• The Show All Questions Button Displays all the questions and options of that exercise on a single page.
• The Option Box Icon (Box with Question mark icon), is the box that is to be selected for the correct option. By selecting/clicking the option box, a pop-up box will open by displaying the result of the option selected.