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Asked/Added Questions From NCERT: Physics


Question 1. Asked on :30 September 2021:07:56:14 PM

Why it is easier to work with pulley than a fixed pulley?

 

-Added by Deborah KC Physics » Simple Machine

Answer by: Master Mind

Master Mind

 The fixed pulley need more force than a normal pulley as when we apply a force on a rope of a pulley it experiences greater force on the object that we apply. Therefore it is easier to work with pulley.

-Answered by Master Mind On 17 December 2021:07:43:34 AM


Question 2. Asked on :25 November 2020:01:26:40 PM

 Why do we dissolve oleic acid in alcohal?

-Added by Himanshi Verma Physics » Motion In A Straight Line.

Answer by: Himanshi Verma

Himanshi Verma

 Oleic acid is soluble in alcohal and diluting it with alcohal will replace it's concentration consequently it will helps to form a very thin (almost the molecular thickness) get formed and we can measure it's thickness by calculating volume.

-Answered by Himanshi Verma On 25 November 2020:01:28:10 PM


Question 3. Asked on :25 November 2020:01:22:49 PM

 What is accuracy and precision?

-Added by Himanshi Verma Physics » Motion In A Straight Line.

Answer by: Himanshi Verma

Himanshi Verma

 Accuracy :- Accuracy is how close a measured value is to the actual value.

Precision:- Precision is how closed the measured value are to each other.

-Answered by Himanshi Verma On 25 November 2020:01:24:02 PM


Question 4. Asked on :25 November 2020:01:21:18 PM

 Name two phyiscal quantities that have units but no dimensional formula?

-Added by Himanshi Verma Physics » Motion In A Straight Line.

Answer by: Shruti Srivastva

Shruti Srivastva
Plane Angle and Angular Displacement.

-Answered by Shruti Srivastva On 13 April 2021:01:00:48 PM

Answer by: Himanshi Verma

Himanshi Verma

 Plane Angle, Angular displacement have units but no dimensional formula.

-Answered by Himanshi Verma On 25 November 2020:01:22:11 PM


Question 5. Asked on :25 November 2020:01:18:43 PM

 Define negative acceleration?

-Added by Himanshi Verma Physics » Motion In A Straight Line.

Answer by: Himanshi Verma

Himanshi Verma

 If the velocity of a body is decreasing with time then it is said to travel with a negative acceleration. {Retardation, declaration}.

-Answered by Himanshi Verma On 25 November 2020:01:19:28 PM


Question 6. Asked on :25 November 2020:01:15:34 PM

 A ball is thrown vertically upwards. What is it's velocity at the highest point?

-Added by Himanshi Verma Physics » Motion In A Straight Line.

Answer by: Himanshi Verma

Himanshi Verma

 It continuous upwards unit it reaches a certain position, and then it falls downwards, At that highest point, it's velocity is instantaneously zero.

-Answered by Himanshi Verma On 25 November 2020:01:16:54 PM


Question 7. Asked on :25 November 2020:01:13:41 PM

 What is Unit vector?

-Added by Himanshi Verma Physics » Motion In A Plane

Answer by: Himanshi Verma

Himanshi Verma

 A unit vector is a vector that has a magnitude of 1 unit. A unit vector is also known as direction vector.

-Answered by Himanshi Verma On 25 November 2020:01:14:31 PM


Question 8. Asked on :25 November 2020:01:09:39 PM

 State the Triangular law of vector addition.

-Added by Himanshi Verma Physics » Motion In A Straight Line

Answer by: Himanshi Verma

Himanshi Verma

 It states that if two vectors acting on a particle at the same time are represented in magnitude and direction by the two sides  of a triangle in one order, their resultant vector is represented in magnitude and direction by the third side of the triangle taken in opposite order.

-Answered by Himanshi Verma On 25 November 2020:01:11:05 PM


Question 9. Asked on :25 November 2020:01:04:53 PM

 What is instantaneous speed and velocity?

-Added by Himanshi Verma Physics » Motion In A Straight Line

Answer by: Himanshi Verma

Himanshi Verma

 Instantaneous speed = The speed of a body at a particular instant of time during the motion is called instantaneous speed.

Instantaneous velocity = The velocity of a body at any instant of time is known as instantaneous velocity.

-Answered by Himanshi Verma On 25 November 2020:01:05:35 PM


Question 10. Asked on :25 November 2020:01:02:09 PM

Define Average speed

-Added by Himanshi Verma Physics » Motion In A Straight Line

Answer by: Himanshi Verma

Himanshi Verma

 The average distance covered by a body per unit time is known as average speed. It is calculated as the ratio of the total distance travelled to the total time taken.

-Answered by Himanshi Verma On 25 November 2020:01:03:26 PM


 

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