4NT SCI - HBL 21 April 2023

Which of the following electromagnetic waves is used in a mobile phone?

• gamma ray
• micro waves
• infrared waves
• x-rays

Wave transfers ___________________ from one point to another.     

• both matter and energy
• matter
• energy
• neither matter nor energy

Which of the following is NOT an electromagnetic (EM) wave? 

• Radio waves
• Microwaves
• Sound waves
• Infrared waves 

Which of the following electromagnetic waves is used by remote control unit?                       

• X-rays
• Gamma rays
• Infrared waves
• Ultraviolet

The figure shows a water wave on the surface of water. The wavelength is represented by the distance between _______ 

• P and T
• P and Q
• Q and S
• Q and R

A child drops a ball from a window and observes that it bounces to a height lower than that of the window. Why does this happen?

• Energy is conserved, but some is converted into sound.
• Energy is conserved only when there is no air resistance.
• Energy is not conserved, when there is no air resistance.
• Energy is not conserved, because some is converted to sound.

The diagram shows different positions of a swinging pendulum. At which point does the pendulum have the highest gravitational potential energy?

• A
• B
• C
• D

Which of the following is a unit of energy?

• volt
• watt
• joule
• ampere

Which of the following types of energy is possessed by a soccer ball in mid-flight?    
1  kinetic energy  
2  gravitational potential  
3  elastic potential

• 1 and 2 only
• 1 and 3 only
• 2 and 3 only
• 1, 2 and 3

An electric kettle has a power rating of 150 W. How much energy is used if it has been turned on for 5 minutes?

• 30 J
• 750 J
• 9000 J
• 45000 J