4.In the context of measures taken to combat Covid-19, what is ‘CoNTeC’, that was making news recently?

 

[A] Tele-medicine Hub
[B] Mobile Application
[C] Portal to buy medicines
[D] Database of Hospitals

Grade 9 Science electricity multiple choice:

1. All of the following are examples of a load in an electric circuit, except…
2. heaters b. motors c. lamps d. batteries

1. A continuous path in which electrons can flow is called a(n)…
2. electric circuit b. photovoltaic cell c. electric cell d. electrolyte

1. The part of an electric circuit that converts electrical energy into other forms of energy is called a(n)…
2. connecting wire b. energy source c. load d. switch

1. What type of energy does a fan convert into motion?light energy b. thermal energy c. electrical energy d. none of the above

1. An electric cell that may only be used once is called a… a. primary cell secondary cell c. fuel cell d. photovoltaic cell

1. Electrons will only flow in an electrical circuit if …
2. the circuit breaker is open. c. their path is complete and continuous
3. there is a gap between the conductors d. the switch is not closed.

1. The rate at which electric charges (electrons) move past a given point in a circuit is called…
2. voltage b. resistance c. current d. none of the above

1. The symbol for electric current is…
2. I b. V c. A d. C

1. A device used to measure potential difference is called a(n)…
2. electroscope b. ohmmeter c. ammeter d. voltmeter

1. Electrical resistance is measured in…

      a. amperes b. watts c. ohms d. volts

1. Electrical Resistance is the ability (or force) that …
2. stops or slows down the electric charges in a circuit        
3. that can either help or stop the electric charges in a circuit
4. helps or speeds up the electric charges in a circuit        
5. none of these are correct

1. Loads connected in series…
2. do not affect the total resistance of the circuit       c. increase the total resistance of the circuit
3. decrease the total resistance of the circuit       d. It depends on the wattage of the loads

1. What will happen to other lamps on a parallel circuit if an additional light bulb is added?
2. They will continue to glow the same brightness               c. Some will get brighter and some will go out
3. They will all continue to glow and will get brighter            d. They will all go out

1. A series circuit has three identical lamps. The potential difference of the energy source is 30V. The resistance of each lamp is 5 Ω. What is the current through each lamp? (Hint: draw a picture of the circuit)

1. 0.167 A b. 2 A c. 6 A d. 150 A

1. One watt of electrical power is equal to…
2. one joule per second       b. one joule per minute   c. ten joules per second d. ten joules per minute

1. Electrical energy in your home is measured in…
2. Joules       b. Amps       c. Kilowatt-Hours     d. Watts

1. If you wish to lower your energy costs, which of the following times would be best to use an electric clothes dryer?
2. Monday at 1:00 p.m.   b. Tuesday at 9:00 a.m. c. Friday at 3:00 p.m.             d. Saturday at 8:00 p.m.

1. An older electrical safety device that contains a small wire that melts and breaks apart when current is too high is a…
2. Circuit Breaker       b. Fuse       c. Ground Fault Interrupter       d. 3-hole outlet

1. This electrical safety device, which is typically found in bathrooms, sc

1. Circuit Breaker       b. Fuse       c. Ground Fault Interrupter     d. 3-hole outlet

1. Which of the following devices measures the amount of energy used every hour in a house or apartment building?
2. Phantom load       b. Fuse               c. Smart Meter         d. Ground Fault Interrupter

Please answer all 4 questions correctly.

1. Applying Concepts 

All mammals have the same size hearts relative to their body size. Do their hearts beat at the same rate?

2. Interpreting Data

a. What is the resting pulse rate of a 7,000-kilogram African bull elephant?

b. What is the resting pulse rate of a 20-gram mouse? How many complete heartbeats is that per second?

c. What general statement can be made regarding the effect of body size on heart rate in mammals?

3. Making Inferences

a. The data in the graph, plotted on logarithmic coordinates (that is, the scale rises in powers of 10), fall nicely upon a straight line. How would you expect them to look plotted on linear coordinates?

b. As you walk through the graph from left to right, the line slopes down. This is called a negative slope. What does the negative slope of the line signify?

4. Drawing Conclusions

If you plotted data for an experiment measuring body mass versus resting oxygen consumption, you would get exactly the same slope of the line as shown in this graph. What does this tell us about why body size affects heart rate in mammals as it does?