List of practice Questions

If a compass needle be kept at magnetic north pole of the earth, the compass needle may stay in any direction. Dip needle will stay vertical at the north pole of earth
If $\mu_0$ is absolute permeability of vacuum and $\mu_r$ is relative magnetic permeability of another medium, then permeability $\mu$ of the medium is
Imagine rolling a sheet of paper into a cylinder and placing a bar magnet near its end as shown in figure. What can you say about the sign of $\vec{B}.d \vec{A}$ for every area $d \vec{A}$ on the surface?
In a certain place, the vertical component of earth?? magnetic field is 0.5 oersted and dip angle is $60^?$. The earth?? magnetic field at that place is
In the magnetic meridian of a certain place the horizontal component of earth?? magnetic field is 0.25 G and dip angle is $60^?$. The magnetic field of the earth at this location is
Magnetic dipole moment is a vector quantity directed from
Magnetic meridian is
Magnetic susceptibility of a diamagnetic substances
Point out the correct direction of magnetic field in the given figures.
The range of magnetic susceptibility and relative magnetic permeability for diamagnetic substances are
The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Soft iron has high magnetic permeability and cannot be easily magnetized or demagnetized.
The time period of a freely suspended magnetic needle does not depend upon
The unit of intensity of magnetisation $(I)$ is
Two identical thin bar magnets are placed mutually at right angles such that the north pole of one touches the south pole of the other. The length and the pole strength of each bar are $I$ and $m$. The resultant magnetic moment of the system is :
What is the magnitude of axial field due to a bar magnet of length 3 cm at a distance of 75 cm from its mid-point if its magnetic moment is $0.6\, A\, m^2$?
Which of the following instruments is used to measure magnetic field
Which of the following is correct about magnetic monopole?
Which of the following is not a magnetic substance?
Which of the following is responsible for the earth?? magnetic field?
On $Q - \{1\}$ such that $a * b = a + b-ab$. Find the identity element.
Suppose that the number of elements in set $A$ is $p$, the number of elements in set $B$ is $q$ and the number of elements in $A \times B$ is $7$. Then $p^2 +q^2 =$
The inverse of the function $ y = \frac{10^x - 10^{-x}}{10^x + 10^{-x}}$ is equal to :
The number of binary operations that can be defined on a set of $2$ elements is
0.01 M solution of $H_2A$ has pH equal to 4. If $K_{a1}$ for the acid is $4.45 \times 10^{-7}$, the concentration of $HA^-$ ion in solution would be
1 mole of $N_2$ and 2 moles of $H_2$ are allowed to react in a 1 $dm^3$ vessel. At equilibrium 0.8 mole of $NH_3$ is formed. The concentration of $H_2$ in the vessel is