Where is donor energy level located?

The number of electric lines of force originating from a charge of 1 C is:

A ray of light incident at 25° on one refracting surface of a prism of angle 60° suffers a deviation of 50°. What will be the angle of emergence?

A galvanometer having a resistance of \(7 \Omega\) is shunted by a resistance of \(3 \Omega\). If the total current is 1 A, the value of current passing through the shunt is

An a.c. voltage is applied to a resistor of resistance \(5 \Omega\) and an inductor having inductive reactance \(5 \Omega\) connected in series. The phase difference between the applied voltage and the current in the circuit is:

A current I flows in a circular loop of radius R. The magnetic field at a point on its axis at distance r from the center of the loop is

A planoconvex lens has the radius of curvature of its curved surface 50 cm and the refractive index of its material is 1.5. Its focal length will be

If \(A\) and \(B\) are two events such that \(P(A)=\frac{1}{2}, P(B)=\frac{1}{3}, P(B \mid A)=\frac{1}{4}\), then \(P(A \mid B)\) is :

Arrange the following steps involved in Frederick Griffith experiment in correct order.
(A) When R-strain was injected into mice, the mice remained alive.
(B) When heat killed S-strain was injected into mice, the mice remained alive.
(C) The Streptococcus pneumoniae bacteria grown on a culture plate to produce the S and R strain colonies.
(D) When S-strain was injected into mice, the mice died.
(E) When heat killed S-strain + live R-strain was injected into mice, the mice died.
Choose the correct answer from the options given below :

Which of the following statements are correct?
A. Relative motion between a coil and a magnet induces the electric current.
B. The charges in motion can experience force due to a stationary magnet.
C. Mutual inductance of a pair of coils does not depend on their separation as well as their relative orientation.
D. Self inductance plays the role of inertia.
Choose the correct answer from the options given below:

Benzene ring in phenol is expected to give the characteristic substitution or replacement reactions i.e. halogenation, nitration, sulphonation, alkylation etc. In these reactions, the attacking reagent is electrophile. The phenolic group activates the ortho and para positions in the ring due to conjugation. Disubstitution reactions are quite fast as the electron density in the ring has increased considerably. Phenols do not respond to nucleophilic substitution reactions as it is influenced by phenolic group.
Victor Meyer test gives following observations. Match List I with List II:

List-I	List-II
A. Blood red colouration	I. Tertiary alcohol
B. Blue colouration	II. Phenols
C. Colourless solution	III. Primary alcohol
D. Violet colouration with \(\text{FeCl}_3\)	IV. Secondary alcohol

Choose the correct answer from the options given below:

Figure shows a rectangular conductor PQRS in which the conductor PQ is free to move. The conductor PQ is moved towards the left with a constant velocity V as shown in the figure. Assume that there is no loss of energy due to friction. What will be the magnetic flux linked with the loop PQRS and the motional emf?

Which intra uterine contraceptive device is responsible for making the cervix hostile to sperms and uterus unsuitable for implantation?