A charged object attracts an uncharged object by producing opposite charges in the nearer end of the uncharged object by the process of:
electric potential
electric induction
friction
electromagnetic induction
Which of the following is safest way to protect yourself from lightning?
run to an open field
open an umbrella for cover
take shelter under a tree
squat low on ground
When a glass rod is rubbed with a piece of silk cloth, then:
the glass rod and silk cloth both acquire positive charge.
the glass rod becomes positively charged while the silk cloth has a negative charge
the glass rod and silk cloth both acquire negative charge
the glass rod becomes negatively charged while the silk cloth has a positive charge
When a plastic comb is rubbed with dry hair, the hair get positively charged by friction. In this process:
the hair lose some positive protons
the hair gain some positive protons
the hair lose some negative electrons
the hair gain some negative electrons
An inflated rubber balloon is rubbed with a woollen cloth whereas a ballpoint pen refill is rubbed with a polythene bag. Which of these will get positively charged?
Inflated rubber ballon
Woollen cloth
Ballpoint pen refill
Polythene bag
Which force is present between two charged bodies?
Electrostatic force
Electromagnetic force
Gravitational force
Frictional force
The force present between two charged bodies is:
electrostatic force
electromagnetic force
gravitational force
frictional force
Which of the following is the best thing to do during heavy lightning?
Lying on the ground in an open place
Going into the nearest water body
Staying indoors away from metalic doors or windows
Standing under a tall tree
A student named the various layers of earth as shown in the figure wrongly. What is the correct sequence starting from the uppermost layer.
1. crust
2. outer core
3. mantle
4. inner core
1. outer core
2. crust
2. mantle
3. outer core
3. crust
Electric charge can be transferred from a charged object to another through:
vacuum
air
insulator
conductor
