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• Question: Path length is defined as -

Posted in: Physics | Date: 16/11/2017

Answer is B. It is the total distance the object has trvelled regardless of where it has travelled.

• Question: Path length is a

Posted in: Physics | Date: 16/11/2017

Path length is a scalar quantity as it is the distance travelled by an object.

• Question: The position of an object moving in a straight line can be specified with refere...

Posted in: Physics | Date: 16/11/2017

The position of a moving body is specified using a co-ordinate system with reference point.

• Question: One mole of an ideal gas at standard temperature and pressure occupies 22.4 L (m...

Posted in: Physics | Date: 16/11/2017

Radius of hydrgen atom = 0.5*10^(-3)

volume of hydrogen atom= (4/3)*(22/7)*(0.5*10^(-3))^3

= 0.524*10^(-30)cu.m

Now 1 mol of hydrogen contains 6.023*10^23 atoms

therefore volume of 1 mol of hydrogen atom Va = 6.023*10^23*0.524*10^(-30)

=3.16*10(-7) cu.m

molar volume of 1 mol of hydrogen atom at STP Vm= 22.4*10(-3) cu.m

therefore the ratio (Vm/Va) = 22.4*10^(-3)/3.16*10(-7)

=7.08*10^4

Hence the molar volume is 7.08*10^4 times higher than the atomic volume. For this reason the inter-atomic seperation is much larger than the size of hydrogen atom.

• Question: Horse power is unit of

Posted in: Physics | Date: 17/11/2017

Horse is a unit of power. it is the measure of rate at which work is being done.

• Question: The number of significant digits in 48,923 is

Posted in: Physics | Date: 17/11/2017

,the number 48,923 has 5 significant digits.

• Question: Physical quantities are

Posted in: Physics | Date: 17/11/2017

Physical quantity is a property of a body which can be measured. therefore the answer is D.

• Question: The significant figures of a number

Posted in: Physics | Date: 17/11/2017

• Question: The number of significant figures in 3400 is

Posted in: Physics | Date: 17/11/2017

Answer D. there are two significant digits as zero is considered to be non significant digit

• Question: A dimensionless quantity

Posted in: Physics | Date: 17/11/2017

A dimensionless qunatityhas no unit

• Question: Which one of following is not the vector quantity?

Posted in: Physics | Date: 17/11/2017

Speed is not a vector quantity. It has only magnitude and no direction and hence it is a scalar quantity.

• Question: "Pascal second" has the dimensions of

Posted in: NEET | Date: 17/11/2017

Pascal second is the SI unit of Coefficient of viscosity. and its dimensions are [M1L-1T-1]

• Question: The number of significant digits in 2,076 is

Posted in: AMIE | Date: 17/11/2017

The number 2076 has 4 significant digits

• Question: Plaese help me to explain how much portion of an atom located at (i) corner and ...

Posted in: AMIE | Date: 17/11/2017

In abody centerd cubic cell, there are 9 atoms. out of which 8 atos are located at the 8 corners of the cube and the 9th atom is at the center of the cube. the 8 atoms at the corners of the cube are shared by the neighbouring unit cells. In total 8 units cells can be placed adjoining a corner of a unit cell. hence every atom at the corner of the unit cell is shared by other 8 unit cells. hence 1/8th portion of an aatom is present in the unit cell.

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