## Current Electricity Quiz-8

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q71. The tolerance level of a resistor with the colour code red, blue, orange, gold is
•  ±5%
•  ±10%
•  ±20%
•  ±40%
Solution
The tolerance level of resistance is mostly 1%, 2%, 5% and 10%. In old days 20% was also common, but these are now rare. Now a days 5% tolerance in treands.

Q72.For a given thermocouple neutral temperature
•  Is a constant
•  Depends on cold junction temperature
•  Depends on inversion temperature
•  Double that of cold junction temperature
Solution
Neutral temperature is defined as temperature of a hot junction of a thermocouple at which the electromotive force of the thermocouple attains its maximum value when cold junction is maintained at a constant temperature of 0℃. Hence, for a given thermocouple neutral temperature is a constant.

Q73.  A battery consists of a variable number (n) of identical cells, each having an internal resistance r connected in series. The terminal of the battery is short-circuited. A graph of current versus the number of cells will be as shown in figure
•

•

•

•

Solution

Q74. In the circuit shown the value of I in ampere is

•  1
•  060
•  0.4
•  5
Solution

Q75.In a potentiometer of one metre length, an unknown e.m.f. voltage source is balanced at 60 cm length of potentiometer wire, while a 3 volt battery is balanced at 45 cm length. Then the e.m.f. of the unknown voltage source is
•  3V
•  2.25V
•  4V
•  4.5V
Solution

Q76. x g of Ag is deposited by passing 4 A of current of for 1 h. How many gram of Ag will be deposited by passing 6 A for 40 min?
•  2x g
• 4x g
•  x g
•  5x g
Solution

Q77.The main supply voltage to a room is 120 V. The resistance of the lead wires is 6Î©. A 60 W bulb is already giving light. What is the decrease in voltage across the bulb when a 240 W heater is switched on?
•  No change
•  10 V
•  20 V
•  More than 10 V
Solution

Q78.Two bulbs 40 W and 60 W and rated voltage 240 V are connected in series across a potential difference of 420 V. Which bulb will work at above its rated voltages?
•  40 W bulb
•  60 W bulb
•  Both will work
•  None of these
Solution

Q79.A current of 1.5 A flows through a copper voltmeter. The thickness of copper deposited on the electrode surface of area 50 cm2 in 20 min is (density of Cu=9000 kgm-3;ECE of Cu=3.3×10-7 kgC-1
•  1.3×10-4 m
•  1.3×10-5 m
•  2.6x10-4 m
•  2.6×10-5 m
Solution

Q80. If in the circuit shown below, the internal resistance of the battery is 1.5 Î© and VP and VQ are the potentials at P and Q respectively, what is the potential difference between the points P and Q

•  Zero
•  4 volts (VP>VQ)
• 4 volts (VQ>VP)
•  2.5 volts (VQ>VP)
Solution

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