Physics Test 181

Result

Physics Test 181

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Weekly Quiz Competition

Question 1
4 / -1

A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is: (Take 1 cal = 4.2 joule)

A
2.365 W

B
23.65 W

C
236.5 W

D
2365 W

Solution
Question 2
4 / -1

A
P₁ > P₂

B
P₁ < P₂

C
P₁ = P₂

D

Solution
Question 3
4 / -1

A

B

C

D

Solution

The net force becomes zero at the mean point. Therefore, linear momentum must be conserved.
Question 4
4 / -1

A

B
-

C

D

Solution
Question 5
4 / -1

Figure shows two charges of equal magnitude separated by a distance 2a. As we move away from the charge situated at x = 0 to the charge situated at x = 2a, which of the following graphs shows the correct behaviour of electric field?

A

B

C

D

Solution

For the distances close to the charge at x = 0 the field is very high and is in positive direction of x-axis. As we move towards the other charge the net electric field becomes zero at x = a thereafter the influence of charge at x = 2a dominates and net field increases in negative direction of x-axis and grows unboundedly as we come closer and closer to the charge at x = 2a.
Question 6
4 / -1

Figure (i) shows two capacitors connected in series and connected by a battery. The graph (ii) shows the variation of potential as one moves from left to right on the branch AB containing the capacitors. Then

A
C₁ = C₂

B
C₁ < C₂

C
C₁ > C₂

D

Solution
Question 7
4 / -1

A

B

C

D

Solution
Question 8
4 / -1

A wire carrying current I has the shape as shown in adjoining figure. Linear parts of the wire are very long and parallel to X-axis while semicircular portion of radius R is lying in Y-Z plane. Magnetic field at point O is :

A

B

C

D

Solution
Question 9
4 / -1

A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet such that is in the plane of the coil. If due to a current i in the triangle a torque t acts on it, the side l of the triangle is

A

B

C

D

Solution
Question 10
4 / -1

A metal ring is held horizontally and bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet

A
is equal to g

B
is less than g

C
is more than g

D
depends on the diameter of ring and length of magnet

Solution

Induced e.m.f. in the ring opposes the motion of the magnet.