Physics Test

Result

Physics Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

A heater wire consumes power `P` when connected to a 220V source. If the wire is cut into four equal pieces, which are now connected in parallel, find the power consumed by the combination, if connected to the same power supply.

A
4P

B
P/4

C
16P

D
P/16

Solution
Question 2
1 / -0

Two electric bulbs rated P1watt V volt, and P2watt V volt are connected in parallel, and applied across V volt. The total power will be

A
(P1 + P2) watt

B

C

D

Solution
Question 3
1 / -0

If power dissipated by 5Ω resistor is 20 W, then find the power dissipated by 4Ω resistor.

A
10 W

B
20 W

C
4 W

D
15 W

Solution
Question 4
1 / -0

The thermo emf produced in a thermocouple is 3μ V/°C. If the temperature of the cold junction is 20°C and the thermo emf is 0.3 mV, the temperature of the hot junction is

A
80°C

B
100°C

C
120°C

D
140°C

Solution
Question 5
1 / -0

Consider the following two statements A and B and identify the correct answer.

A:Constantan-Copper thermo-couple is generally used to measure temperature upto 1600oC.

B:In an iron-copper thermocouple, current flows from iron to copper through cold junction.

A
Both A and B are true.

B
Both A and B are false.

C
A is true but B is false.

D
A is false but B is true.

Solution

Both A and B are true. In an iron-copper thermocouple, current flows from iron to copper since iron comes first in see back list.
Question 6
1 / -0

A
cos A : cos B : cos C

B
cos: cos: cos

C
sin: sin: sin

D
sin A : sin B : sin C

Solution
Question 7
1 / -0

A
3 : 1 : 1

B
2 : 3 : 2

C
1 : 2 : 3

D
2 : 3 : 1

Solution
Question 8
1 / -0

If the forces of magnitude 12 Kg wt, 5 Kg wt and 13 Kg wt acting at a point are in equilibrium, then the angle between the two forces is

A
30°

B
90°

C
60°

D
45°

Solution

Since (13)2= (12)²+ (5)²

So two of them are inclined at 90 to each other.
Question 9
1 / -0

Two men carry a weight of 240 kg between them by means of two ropes fixed to the weight. One rope is inclined at 60× to the vertical and the other at 30×. The tensions in the ropes are

A
120 kg, 120 kg

B
120√3 kg, 120 kg

C
120√3 kg, 120√3 kg

D
None of these

Solution
Question 10
1 / -0

The resultant of P and Q is R. If P is reversed, Q remains the same, the new resultant S is at right angle to R. The value of P / Q is

A
1

B
2

C
1/2

D
none of these

Solution