Physics
The below diagram shows different copper conductors of diameters d and 2d and lengths, which are multiples of l. The increasing order of their resistances will be:
- A < B < C < D
- A < C < D < B
- A < D < C < B
- D < A < C < B
Related Questions
The below picture shows three cylinders filled with water to a different extent. The tuning forks L, M and N in vibration produce louder sound when held above the mouth of the cylinders. Which combination is correct for hearing a louder sound of the tuning fork?
- L – R, M – Q, N – P
- L – P, M – Q, N – R
- L – R, M – P, N – Q
- L – Q, M – R, N – P
Three metals, A, B and C, are supplied with the same quantity of heat. Their masses are in the ratio 2 : 3 : 4. If they show the same rise in the temperature, then the ratio of their thermal capacities will be:
- 1:1:1
- 4:3:2
- 2:3:4
- 2:3:1
The diagram shows the magnificent dome at Gol Ghumbaz at Bijapur. A boy standing at A whispers, and it is clearly heard at B across the huge dome.
[Speed of sound is 330 ms-1]
Assertion (A) : The distance travelled by sound waves (x+y) should be < 33 m.
Reason (R) : Sound reflected within 0.1 s is not heard by humans.
- A and R are true, and R is the reason for A.
- A and R are true, and R is not the reason for A.
- A is true, but R is false.
- A is false, but R is true.
A magnetic compass is present on a small table, very close to the wall in a room. A man enters the room and switches on the Air Conditioner fitted near the ceiling. He observes that the needle in the compass shows immediate deflection. Identify the most probable reason for the deflection.
- Air blowing in the room.
- Current starts flowing through AC wire concealed in the adjacent wall.
- Vibrations are produced when the Man starts talking to his wife in the kitchen.
- Vibrations were produced due to a file in his hand that fell on the ground.