Question

1

A river is flowing from West to East at a speed of 5m/min. A man on the South bank of the river, capable of swimming at 10m/min in still water, wants to swim across the river in the shortest time. He should swim in a direction.

0° East of North

30° West of North

due North

C 30° East of North

A boat which has a speed of 5 Km/h in still water crosses a river of width 1 km along the

shortest possible path in 15 min. The velocity of the river water in km/h is

V41

С 4

3

1

A physical quantity is one which

1. is a vector quantity

2. cannot be measured

3. is a scalar quantity

4. can be measured

The unit of speed is a

• cannot say

• fundamental unit

• derived unit

• neither fundamental nor derived

What is the SI unit of Planck's constant?

• watt second

• watt per second

• joule second

• joule per second

The error in the measurement of the radius of a sphere is 1%. The

error in the measurement of the volume is

• 1%

• 9%

• 3%​

Answer 1

Answer:

Using Ohm's law, for constant potential difference, we may write: I∝R1 So, if the resistance is doubled, current becomes half.

Explanation:

Using Ohm's law, for constant potential difference, we may write: I∝R1 So, if the resistance is doubled, current becomes half.