Spring tides refer to:

• Greatest difference in the sea level at high and low tides.

• Lowest difference in the sea level at high and low tides.

• No difference in the sea level at high and low tides.

• Counteraction of gravitational pull of the Sun to that of Moon.

Which one of the following energy is stored in the links between the atoms?

• Nuclear energy

• Chemical energy

• Potential energy

• Thermal energy

The light energy escaping from the Sun can be spread by:

• A shower of rain drops

• A plane mirror

• A convex lens.

• A combination of a convex lens and a concave lens.

The correct sequence of energy transfer that occurs when an apple falls to the ground is:

• Gravitational potential energy → heat energy to air → kinetic energy → heat energy to ground and apple → sound energy.

• Gravitational potential energy → sound energy → kinetic energy → heat energy to air → heat energy to ground and apple.

• Gravitational potential energy → kinetic energy → heat energy to air → heat energy to ground and apple → sound energy.

• Gravitational potential energy → kinetic energy → sound energy → heat energy to air → heat energy to ground and apple.

Which one of the following can charge an insulator

• Current electricity

• Static electricity

• Magnetic field

• Gravitational field

At 20°C, the speed of sound in water is approximately

• 330 m/s

• 800 m/s

• 1500 m/s

• 5000 m/s

Which one of the following could be the melting point of iron?

• 25°C

• 37°C

• 500°C

• 1500°C

Let us consider a copper wire having radius r and length l. Let its resistance be R. If the radius of another copper wire is 2r and the length is l/2 then the resistance of this wire will be:

• R

• 2R

• R/4

• R/8

Consider the following statements about a solenoid

1. The magnetic field strength in a solenoid depend upon the number of turns per unit length in the solenoid.
2. The magnetic field strength in a solenoid depend upon the current flowing in the wire of the solenoid
3. The magnetic field strength in a solenoid depend upon the diameter of the solenoid.

Which of the statements given above are correct?

• 1, 2 and 3

• 1 and 3 only

• 2 and 3 only

• 1 and 2 only

10.

Light year is a unit of measurement of

• very large distances

• time interval in years

• amount of light received on earth in a year

• mass of atoms