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###### Science · Physics
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4. Which of the following is correct about the magnetic field strength in a solenoid?

A. The magnetic field strength at a point well inside a solenoid is uniform and dependent on the length of the solenoid.

B. The magnetic field strength at a point well inside a solenoid is non-uniform and dependent on the length of the solenoid.

C. The magnetic field strength at a point well inside a solenoid is non-uniform and independent on the length of the solenoid.

D. The magnetic field strength at a point well inside a solenoid is uniform and independent of the length of the solenoid.

6. Which of the following best describes wave motion?

A. The transfer of energy from one place to another

B. The transfer of matter from one place to another

C. Vibrations which transfer energy from one place to another

D. Vibrations which are transverse to the direction of motion

7. Two objects A and B are at the same temperature. What does this imply about the kinetic energy of the molecules in each object?

A. The average kinetic energy of the molecules in object A will be the same as in object B

B. The kinetic energy of any molecule in object A will be the same as that of any molecule in object B

C. The lowest kinetic energy of any molecule in object A will be the same as in object B

D. The highest kinetic energy of any molecule in object A will be the same as in object B

8. A point source of sound has an intensity of l0 at a distance of 1.0 m from the source. What will the intensity be at 0.5 m from the source?

A. 4 l0

B. 2 l0

C. l0

D. 𝐼𝐼𝐼𝐼 2

9. Which one of the following is the best description of the image formed by a concave lens?

A. It can be magnified and virtual

B. It is always virtual and diminished

C. It can be diminished and real

D. It can be magnified and real

10. The force between two equal charges q, is F newtons when they are d cm apart. How far apart will charges of q and 2q need to be so that the force is the same?

A. 𝑑𝑑 2

B. 𝑑𝑑

4 C. 2d

D. √2�