Scalars and the Need for Vectors

Q.

What is means of zero vector? Explain with example?

Q. There is a uniformly charged non conducting solid sphere made of material of dielectric cons†an t one. If electric potential at infinity be zero, then the potential at its surface is V. If we take electric potential at its surface to be zero, then the potential at the centre will be

Q. Which of the following statements is true?

1. A scalar quantity is the one that is conserved in process.
2. A scalar quantity is the one that does not vary from one point to another in space.
3. A scalar quantity is the one that can never take negative values.
4. A scalar quantity has the same value for observers with different orientation of the axes.

Q.

What is frame of reference

Q. From Bernoulli's principle it was found that as area decreases velocity increases and pressure at that point decreases. But we also know that pressure is inversely proportional to area[P=F/A]. So it is found that pressure is proportional to the area[Bernoulli], but also pressure is inversely proportional to the area[F/A]. how is that possible?

Q.

Vector quantities can be added according to the rule of arithmetic.

1. True
2. False

Q.

Difference between triangle law and triangle law of vector addition

Q.

Which one of the following is a scalar quantity?

1. Velocity

2. Acceleration

3. Work

4. Momentum​

Q. An eletric field of 20N/C exists along the X-axis in space .calculate the potential difference Vb-Va where the points A and B are given by a)A= (0, 0);B=(4m, 2m) b) A=(0, 0);B=(6m, 5m

Q. 6 A short dipole of dipole moment 4 uC-mi isplaced at origin. The electric potential due to thedipole at the coordinate (3m, 4m) in x, y-plane is(1) 864 V(2) 1152 V(3) 1.152 V(4) 115.2 V

Q.

The torque of a planet about the center of the Sun is -

Q.

A particle moves from A to B along a semicircle of radius 1.0m in 1s. Magnitude of the average velocity would be

Q.

Force has magnitude as well as __________________.

Q.

Force is a physical quantity having magnitude and ________.

Q.

Two masses M1 and M2 placed at a distance 'I' part, let the centre of mass of this system be at a point named C. If M1 is displaced by L1 towards C and M2 is displaced by L2 away from C, find the distance from C where the new centre of mass will be located.

Q. The dimensions of pressure is equal to (1) Force per unit volume (2) Energy per unit volume (3) Force (4) Energy

Q.

Give an example of a body which covers a known distance, but its displacement is zero?

Q.

The electric-field strength vector is given by2.5 xi 1.5y). The electric potential at point(2m , 2m, 1m) is (Considering electric potential at origin to be zero)

Q.

The potential of hollow speed radius 1m is 100 v the potential at 1/2 m and 2 m from the centre of the speed respectively

100 v and 50 v

Zero and 50 v

200 v and 50 v

150 v and 100 v

Q.

Assertion : If dot product and cross product of vector A and vector B are zero, it implies that one of the vector A and B must be a null vector.

Reason : Null vector is a vector with zero magnitude.

Q.

Classify distance and displacement into scalar and vector quantities.

Q.

Can you cross product 4d vectors

Q. Differentiate between the scalar and vector quantities, giving two examples of each.

Q. 77.A dip circle is at right angles to the magnetic meridian.What will be the apparant dip? a)0^° b)30^° c)60^° d)90^°

Q.

Find the value of x;v^x=pressure ^3/2×density ^3/2

Q.

Which of the following is a scalar quantity

1. Displacement

2. Electric field

3. Acceleration

4. Work

Q.

Vector quantities are those which are completely described by magnitude alone.

1. True
2. False

Q. Differentiate between a Scalar and a Vector quantity.

Q. What is pseudo force in nature? What is its magnitude and direction

Q.

Can displacement be negative? Can path length be negative?