Physics Test 15

Result

Physics Test 15

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

Two identical heaters rated 220 volt -1000 watt are placed in parallel with each other across 220 volt line; then the combined power is

A
1000 watt

B
2000 watt

C
500 watt

D
4000 watt

Solution

In parallel , the total power

P = P₁+P₂ = 1000 + 1000 = 2000 W
Question 2
4 / -1

The thermo-emf of a thermocouple varies with the temperature θ of the hot junction as E = aθ + bθ ² in volts ,where the ratio a/b is 700⁰C. If the cold junction is kept at 0⁰C, what is the neutral temperature?

A
700⁰C

B
350⁰C

C
1400⁰C

D
no neutral temperature is possible for this thermocouple

Solution

For the given thermocouple the induced emf increases with the increase in the temperature of the hot junction so no neutral temperature is possible for this thermocouple
Question 3
4 / -1

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of :

A
each of these decrease

B
copper strip increases and that of germanium decreases

C
copper strip decreases and that of germanium increases

D
each of the above increases

Solution

Since we know that resistance of copper decreases with decrease in temperature while resistance of germanium increases with decrease in temperature.
Question 4
4 / -1

Sum of the two binary numbers (100010)₂ and (11011)₂ is

A
(111101)₂

B
(111111)₂

C
(101111)₂

D
(111001)₂

Solution

Binary addition of the two given numbers is as below:

100010 + 11011 = 111101; as we have, 0 + 0 = 0, 0 + 1 = 1 and 1 + 1 = 10