Every question from this NCERT chapter, with a detailed explanation.
With reference to the history of understanding electrical charges, consider the following statements: 1. The ancient Greeks knew that amber attracts light objects like hair when rubbed with fur. 2. Benjamin Franklin proved that lightning and sparks from clothes are two completely different phenomena. 3. The realization of the similarity between lightning and sparks from clothes took approximately two thousand years to occur. Which of the statements given above is/are correct?
Consider the following statements regarding the charging of objects by rubbing: 1. A plastic refill does not acquire any electric charge when rubbed with polythene. 2. When a plastic comb is rubbed with dry hair, both the comb and the hair get charged. 3. The electrical charges generated by rubbing are static in nature. Which of the statements given above is/are correct?
With reference to the interaction between charged objects, consider the following statements: 1. A charged balloon repels another charged balloon. 2. A charged refill repels a charged balloon. 3. A charged refill attracts another charged refill. Which of the statements given above are correct?
By convention, what is the nature of the electric charge acquired by a glass rod when it is rubbed with silk?
Consider the following statements regarding the nature of electric charges: 1. Charges of the same kind repel each other. 2. Charges of different kinds repel each other. 3. A charged glass rod attracts a charged plastic straw rubbed with polythene. Which of the statements given above is/are correct?
With reference to the construction and working of a simple electroscope, consider the following statements: 1. It utilizes plastic strips to detect charge. 2. The foil strips repel each other and open up when a charged body touches the metal clip. 3. It demonstrates that electrical charge can be transferred from a charged object to another through a metal conductor. Which of the statements given above is/are correct?
Which one of the following best describes the process of 'earthing'?
With reference to the development of a thunderstorm, consider the following statements: 1. Air currents move downward while water droplets move upward. 2. Positive charges collect near the upper edges of the clouds. 3. Negative charges accumulate near the upper edges of the clouds. Which of the statements given above is/are correct?
With reference to the charge distribution during a thunderstorm, which one of the following conditions typically exists near the ground just before a lightning strike?
Which one of the following physical phenomena is primarily responsible for the generation of bright streaks of light and sound during a thunderstorm?
With reference to lightning safety, which of the following is considered a safe place during a thunderstorm?
If you are in an open field during a thunderstorm and no shelter is available, which of the following is the most appropriate action to take?
Consider the following statements regarding precautions inside the house during a thunderstorm: 1. It is safer to use mobile phones than wired phones. 2. Bathing under running water is safe during a thunderstorm. 3. Electrical lights can remain on as they do not cause harm. Which of the statements given above is/are correct?
With reference to a Lightning Conductor, consider the following statements: 1. It is a wooden rod installed in the walls of a building. 2. One end of the rod is kept out in the air and the other is buried deep in the ground. 3. It provides an easy route for the transfer of electric charge to the ground. Which of the statements given above is/are correct?
In which layer of the Earth does the disturbance responsible for a tectonic earthquake primarily originate?
What is the term used to describe the weak zones along the boundaries of Earth's plates where earthquakes are most likely to occur?
With reference to the Richter scale, consider the following statements: 1. It is a linear scale. 2. An earthquake of magnitude 6 has much more destructive energy than magnitude 4. 3. An increase of 2 in magnitude implies 1000 times more destructive energy. Which of the statements given above is/are correct?
Consider the following statements regarding earthquake protection in buildings: 1. In highly seismic areas, the use of heavy construction material is preferred over mud or timber. 2. Cupboards and shelves should be fixed to the walls. 3. Fire fighting equipment is unnecessary in tall buildings during earthquakes. Which of the statements given above is/are correct?
If you are indoors during an earthquake, which of the following is the correct safety measure?
Which of the following pairs is correctly matched? 1. Electroscope : Device to detect charged bodies 2. Seismograph : Device to measure ocean depth 3. Richter Scale : Scale to measure earthquake magnitude 4. Lightning Conductor : Device to generate electricity Select the correct answer using the code given below:
With reference to the electric nature of lightning, consider the following statements: 1. It is caused by the accumulation of charges in clouds. 2. The process involves electric discharge only between two clouds, never with the earth. 3. Air, which is normally a poor conductor, conducts electricity during this process. Which of the statements given above are correct?
Which one of the following phenomena explains the attraction of small pieces of paper to a plastic comb that has been rubbed with dry hair?
Consider the following statements about the transfer of charge: 1. Electrical charge can be transferred from a charged object to another through a rubber band. 2. Electrical charge can be transferred from a charged object to another through a metal paper clip. 3. Touching the metal clip of a charged electroscope with a hand causes the foil strips to collapse. Which of the statements given above is/are correct?
In a simple electroscope, what is the observed effect when the two metallic strips receive the same type of electric charge?
What is the scientific reason for the crackling sound often heard when taking off synthetic clothing in dry weather?
With reference to the movement of Earth's plates, consider the following statements: 1. When plates brush past one another, they cause disturbances in the earth's crust. 2. When a plate goes under another due to collision, it causes no disturbance in the crust. 3. These disturbances are confined to the core and do not affect the surface. Which of the statements given above are correct?
Which one of the following actions is considered unsafe if one is outdoors during an earthquake?
Consider the following statements regarding the magnitude of earthquakes: 1. Destructive earthquakes usually have magnitudes higher than 7 on the Richter scale. 2. The Bhuj and Kashmir earthquakes had magnitudes less than 4.0. 3. An earthquake of magnitude 3 is recorded by a seismograph. Which of the statements given above is/are correct?
Match List I with List II and select the correct answer using the code given below: List I | List II A. Amber | 1. Instrument to record earthquake waves B. Electroscope | 2. Resin that attracts hair when rubbed C. Seismograph | 3. Device used to detect electric charge D. Lightning Conductor | 4. Device used to protect buildings from lightning
Which one of the following statements correctly describes the nature of electric current in a metallic conductor?
During the development of a thunderstorm, which one of the following movements contributes to the separation of charges?
Consider the following statements about the 'electric discharge' process during lightning: 1. Electric discharge cannot occur between two clouds. 2. It can occur between clouds and the earth. 3. It occurs when air becomes a conductor due to high voltage. Which of the statements given above is/are correct?
Why is it advised to avoid using wired telephones during a thunderstorm?
Consider the following statements regarding the Earth's plates: 1. The Earth's plates are found in the liquid outer core. 2. The Indian plate is moving. 3. Plate boundaries are safe zones where no earthquakes occur. Which of the statements given above is/are correct?
In the context of seismology, what does the term 'focus' (or hypocentre) refer to?
Consider the following statements about the 'Richter Scale': 1. It measures the magnitude of an earthquake. 2. It is a linear scale where an increase of 2 means double the energy. 3. It is named after Charles Richter. Which of the statements given above is/are correct?
What is the primary source of seismic waves traveling through the Earth?
Consider the following statements regarding the charging of a plastic refill: 1. A plastic refill cannot be charged by rubbing with polythene. 2. It attracts small pieces of paper after rubbing. 3. It attracts a charged glass rod rubbed with silk. Which of the statements given above are correct?
In the context of a lightning strike, how do the metal columns and water pipes installed in a building function?
Which one of the following processes is primarily responsible for the separation of electric charges in the atmosphere that leads to lightning?
Which one of the following is not a direct consequence of a major earthquake?
Consider the following statements regarding the prediction of natural phenomena: 1. Thunderstorms develop in hot, humid tropical areas like India. 2. Earthquakes can be predicted accurately days in advance. 3. Cyclones accompanying thunderstorms are unpredictable in nature. Which of the statements given above is/are correct?
In the term 'static electricity', what does the word 'static' signify regarding the electric charges?
If a charged glass rod attracts a charged plastic straw, what can be inferred about the nature of the charges on the two objects?
What is the scientific reason for a charged object losing its charge when touched by a human hand?
Which one of the following statements best describes the phenomenon of an earthquake?
What is the fundamental working component of a typical seismograph used to record earthquakes?
What is the primary reason for the advice to avoid taking shelter under tall trees during a thunderstorm?
What does the Richter Scale primarily measure with respect to an earthquake?
In ancient times, what was the common belief regarding the cause of lightning?
Consider the following statements regarding the interaction of charged balloons: 1. A charged balloon attracts another charged balloon. 2. A charged balloon attracts an uncharged balloon. 3. An uncharged balloon is attracted by a charged balloon. Which of the statements given above is/are correct?
In a seismograph, what specific data is recorded by the pen on the moving paper or drum?
Consider the following statements regarding the 'Convention' of charges: 1. The charge on a glass rod rubbed with silk is positive. 2. The charge on a plastic straw rubbed with polythene is positive. 3. Positive and negative charges repel each other. Which of the statements given above are correct?
In the context of plate tectonics, where are 'fault zones' or 'seismic zones' primarily located?