Physics: Force, Friction, Temperature and Sound
Tests understanding of basic physics concepts including force and pressure, types of friction, temperature measurement, and properties of sound.
Questions
Which of the following is not a harmful effect of noise pollution?
- Hypertension
- Anxiety
- Deafness
- Asthma
- Insomnia
Force acting per unit area of a surface is called _________.
- friction
- pressure
- gravity
- volume
- magnetism
Which of the following is an example of contact force?
- Like poles of magnets repelling each other.
- Pressing a lump of dough to make chapatti balls.
- Straw rubbed with paper attracting another straw, which is not rubbed with paper.
- Water flowing down from a tap.
- Electromagnets being used to pick up metallic scrap.
What is the S.I. unit of force?
- Hertz
- Pascal
- Newton
- Ohm
- Ampere
A football player and badminton player go to a footwear shop. The former selects grooved shoes while the latter selects spiked shoes. What do you think about their selections?
- To have better grip on the floor.
- To make them look taller.
- To feel comfortable.
- It helps to win matches.
- For giving better blood circulation in their feet.
A huge stone has fallen on a mountain road. A man is clearing out this stone. What is the force required to overcome the friction of this huge stone when he is trying to move it out of the road?
- Sliding friction
- Static friction
- Drag
- Rolling friction
- Amplitude
Which of the following is not a negative effect of friction?
- Worn out soles in an old shoe.
- A child is able to write with a pencil.
- Ball bearing in a machine wearing out.
- Wearing out of tyres of vehicles.
- Machine working for a long time producing too much heat.
What is the range of a lab thermometer?
- 0 - 100 degrees
- Minus 10 - 110 degrees
- 10 - 100 degrees
- 94 - 108 degrees
- Minus 1 - 100 degrees
What is the use of a kink in clinical thermometer?
- Kink gives it a better shape.
- To increase the beauty of the thermometer.
- It prevents mercury level from falling on its own.
- It allows the mercury to rise up faster.
- The kink allows to hold more mercury.
Mr. Arun and Mr. Varun were sitting in their veranda late one evening. Suddenly their dog sat up, focussed its ears keenly and started barking loudly. But both of them observe that nothing is wrong. What could be the reason for this?
- Higher temperature on that day caused it.
- The dog was sick.
- It had seen a ghost.
- Dogs can hear sounds above the audible frequency of human ear.
- Winds had distracted the dog.
A student is doing some experiments in the chemistry lab. He goes to take the temperature of a liquid, which is boiling in a beaker. While doing so, he checks the temperature of the boiling liquid by dipping a lab thermometer into it. Why does he not take the thermometer out of the liquid before reading the temperature?
- The level of mercury rises when it is taken out.
- He does it by mistake.
- The level of mercury begins to fall as soon as the lab thermometer is taken out.
- The temperature of air will be added.
- This is done as it is not a solid.
Which of the following statements about sound is / are incorrect?
- Sound needs a medium to travel.
- Sound is produced by vibrating objects.
- Speed of sound is maximum in gases, and least in solids.
- Sound of frequency below audible range is called infrasonic sound.
- Excessive sound in the environment causes noise pollution.