Tag: physics

Questions Related to physics

Three types of electric cells which provide current are:

physics electric current through conductors study about cells electric cell types of cells

  1. Button cell, solar cell & secondary cell

  2. Solar cell, electrolytic cell, electro chemical cell

  3. $(A)$ and $(B)$ both are correct

  4. Neither $(A)$ nor $(B)$ is correct

Show answer
Correct Option: C
Explanation:

Answer is C.

When a primary cell is used, chemical reactions in the battery use up the chemicals that generate the power; when they are gone, the battery stops producing electricity and is useless. In contrast, in a secondary cell, the reaction can be reversed by running a current into the cell with a battery charger to recharge it, regenerating the chemical reactants. 
The types of cells mentioned in option A and option are correct.
Hence, option C is correct.

What is the direction of flow of current inside a dry cell?

physics electric current through conductors study about cells electric cell types of cells

  1. from $+$ve to $-$ve terminal

  2. from $-$ve to $+$ve terminal

  3. from $+$ve to $+$ve terminal

  4. from $-$ve to $-$ve terminal

Show answer
Correct Option: B
Explanation:
The dry cell consists of a zinc can, electrolyte paste, and a carbon rod in the center. A chemical reaction takes place between the zinc can and the paste. Electrons flow from the negative (zinc) terminal to the positive (carbon) terminal. Electrons are then pumped back to the negative terminal.

The cartridge in a dry cell contains :

physics electric current through conductors study about cells electric cell types of cells

  1. manganese dioxide and ammonium chloride

  2. manganese dioxide and zinc dust

  3. ammonium chloride and zinc dust

  4. manganese dioxide and activated carbon

Show answer
Correct Option: D
Explanation:

The cartridge in a dry cell contains manganese dioxide and activated carbon .

State whether true or false.
In a dry cell, the zinc container acts as the positive electrode.

physics electric current through conductors study about cells electric cell types of cells

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

In a dry cell, the zinc container acts as positive electrodes.T his statement is false.

The longer lead of a LED is always connected to the negative terminal of the battery and the shorter lead is connected to the posltlve terminal of the battery

physics electric current through conductors study about cells electric cell types of cells

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

Show answer
Correct Option: B
Explanation:

Answer is B.
The LED bulb has two leads. The lead connected to the positive terminal of battery is called anode and the lead connected to the negative terminal is cathode. The slightly longer lead than the other is always connected to the positive terminal and the shorter lead is connected to the negative terminal.
Hence, the given statement is false.

A ball lying on the ground does not move on its own because:

physics kinematics motion around us motion and rest moving things around us

  1. it has inertia

  2. it has no energy

  3. it does not want to move

  4. All of the above

Show answer
Correct Option: A
Explanation:

According to Newtons's first law , body remains in its state unless acted by external force. This property of body is termed as Inertia.

Option A is correct.

A tree in a park is in a state of _____with respect to the ground.

physics kinematics motion around us motion and rest moving things around us

  1. rest

  2. motion

  3. data is insufficient

  4. both A and B

Show answer
Correct Option: A
Explanation:

This totally depends on the frame of refrence, any object is relatively at rest or moving.

earth as  frame of refrenece in this case, the tree is at rest.

The earth is in a state of ______

physics kinematics motion around us motion and rest moving things around us

  1. motion

  2. rest

  3. both a and b

  4. linear motion

Show answer
Correct Option: A
Explanation:

Earth is continously moving in its orbit around the sun and on its own axis.

So, it is in the state of motion.

A book lying on a table is an example of -

physics kinematics motion around us motion and rest moving things around us

  1. a body in motion

  2. a body at rest

  3. a body neither at rest nor in motion

  4. none of these

Show answer
Correct Option: B
Explanation:

when the position of a body does not change with respect to its surroundings and time the body is said to be in rest. A book lying on the table is at rest because its position with respect to other object on table or room is fix. 

A book lying on a table is in a state of ____

physics kinematics motion around us motion and rest moving things around us

  1. rest

  2. motion

  3. periodic motion

  4. linear motion

Show answer
Correct Option: A
Explanation:

A book lying on the table is at rest. 


Since no net external force is acting on the book in this state and so it is not capable of moving the book.

Option A is correct.