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Subject :Physics    Class : Class 6

If the same motion occurs again and again, it is said to be repetitive motion. Repetitive motion that repeats itself at regular intervals of time is called periodic motion. A pendulum undergoes periodic motion. The time taken by a pendulum to complete its one oscillation is known as its time period. Frequency of a pendulum is defined as the number of oscillations completed in 1 second.
The frequency of the bob of the pendulum described in above question is

A 0.0625 Hz
B 0.83 Hz
C 0.083 Hz
D 0.625 Hz


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Subject :Physics    Class : Class 6

In this section, each question has two matching lists. Choices for the correct combination of List-I and List-II are given as options (A), (B), (C) and (D) out of which one is correct.

List-I List-II
(P) Shadow of the moon falling on the earth 1. Reflection
(Q) Pinhole camera 2. Solar eclipse
(R) Full moon day 3. Inverted image
(S) Bouncing back of light 4. Lunar eclipse

Code :
P Q R S
A 1 2 3 4
B 2 3 4 1
C 4 3 2 1
D 1 3 2 4


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Subject :Physics    Class : Class 6

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Subject :Physics    Class : Class 7

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Subject :Physics    Class : Class 7

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Subject :Physics    Class : Class 7

In each of the following questions, a statement of Assertion (A) is given followed by a corresponding statement of Reason (R) just below it. Of the statements, mark the correct answer as
Assertion : The position-time graph of uniform motion of a body can have negative slope.
Reason : When the speed of body decreases with time, the position-time graph of the moving body has negative slope.

A If both assertion and reason are true and reason is the correct explanation of assertion
B If both assertion and reason are true but reason is not the correct explanation of assertion
C If assertion is true but reason is false
D If assertion is false but reason is true.


Please tell the answer i think its option B but it is telling that B is wrong!!!

Ans 1:

Class : >Class 7
A

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Subject :Physics    Class : Class 6

In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : The dark part of a shadow that receives small amount light from the source is umbra.
Reason : Umbra is formed only by an extended source of light.

A If both assertion and reason are true and reason is the correct explanation of assertion.
B If both assertion and reason are true but reason is not the correct explanation of assertion.
C If assertion is true but reason is false.
D If assertion is false but reason is true.


what is umbra?

Ans 1:

Class : >Class 7
Vansh, umbra is the darkest part of the shadow whereas penumbra is the lighter and slanting rays of the shadow which falls on a heavenly or celestial body during an eclipse. Hope it helped you. Regards, Niladri Chatterjee

Ans 2:

Class : >Class 7
Vansh, umbra is the darkest part of the shadow whereas penumbra is the lighter and slanting rays of the shadow which falls on a heavenly or celestial body during an eclipse. Hope it helped you. Regards, Niladri Chatterjee

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Subject :Physics    Class : Class 6

Ans 1:

Class : >Class 7
Caseiculture

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Subject :Physics    Class : Class 6

The magnetic field of a magnet is an invisible field which is created by magnetism. The force for magnets to attract other objects is caused by moving electrons. Magnets are made by using electrical and mechanical methods. A temporary magnet can be made by passing electricity through a coil.
Moving _____ is the cause of magnets repelling or attracting each other or other objects.

A protons
B electrons
C molecules
D neutrons


Ans 1:

Class : >Class 6
quoting a part of the question "the force for magnets to attract other objects is caused by moving electrons" hence the answer to your question is option B electrons. a stationary charged particle such as an electron or a proton causes electric fields. A moving charged particle causes both an electric and magnetic field. When we consider real life magnets, they are made up of either atoms or molecules (or both). Since in an atom protons and neutrons(which are uncharged particles) are present in the nucleus it is nearly impossible to separate them from inside the atom. So whatever effect is observed in magnets it is mostly attributed to electrons. I hope that clears your doubt.

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Subject :Physics    Class : Class 6

Ans 1:

Class : >Class 7
is disulfiram approved in canada

Ans 2:

Class : >Class 7
3,422

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