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MOUNIKA MONDAL   from The Newtown School, Kolkata
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 beating of heart is repetitive.
Reason : The beating of heart is a type of periodic motion.

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.


why not the option A is true?

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Aryan Ghanshyam Deshmukh   from B K Birla Public School Kalyan, Kalyan
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.
If the time taken by the pendulum from C to A is 4 s, then the time taken by it to complete its one oscillation is


A 8 s
B 12 s
C 16 s
D 4 s


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Shivyanshi   from Salwan Public School, Plot no. G-4, 16, Second Floor, Vatika India Next, Sector 82, Gurugram, Pin code: 122004
Subject :Physics    Class : Class 7

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Atheeq   from Vaels RBGS, chennai
Subject :Physics    Class : Class 6

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Atheeq   from Vaels RBGS, chennai
Subject :Physics    Class : Class 6

Ans 1:

Atheeq   from Vaels RBGS, chennai
Class : >Class 7

Ans 2:

Atheeq   from Vaels RBGS, chennai
Class : >Class 7
20

Ans 3:

Atheeq   from Vaels RBGS, chennai
Class : >Class 7
20

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Rudra Tara   from ,
Subject :Physics    Class : Class 8

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Sara deore   from st joseph, PUNE
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 : Radiation is a process of transfer of heat in which a material medium is not necessary.
Reason : The heat from the sun reaches us through millions of miles of empty space by convection.

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.

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Aryan   from ABN, Roorkee
Subject :Physics    Class : Class 7

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Aryan jain   from DPS Noida, Delhi
Subject :Physics    Class : Class 10

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Aatmaj and Veeha   from HAPS hamirpur, HP, Hamirpur, HP
Subject :Physics    Class : Class 8

An athlete is throwing a discus in a sports event. He holds the discus in his hand and gives it a circular motion by rotating his own body. Then he releases the discus in the desired direction. The discus moves along a straight line.
Which statement about the direction of the velocity of this discus is correct?

Athe direction of velocity constantly changes
Bthe direction of velocity is constant through out the motion
Cdirection of velocity changes at some points only.
Dboth (B) and (D) are correct


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