To find the focal length of a convex lens, a student obtains the real, inverted and magnified image on the screen as shown in the figure below.

Now the whole set up is immersed in water without disturbing the object and position of the screen. What will be student's observation on the screen?

The shortest wavelength of the spectral lines emitted in Balmer Series is : [Rydberg constant \( = 10^7 \text{ m}^{-1} \)]

Arrange the following elements of a generalised communication system in the sequencial order :
(A) Channel
(B) Information source
(C) Transmitter
(D) Receiver
(E) User of information
Choose the correct answer from the options given below :

The minimum energy required to excite a Hydrogen atom from its ground state is :

Identify the incorrect statement(s) among the following:
when a dielectric medium is introduced between the plates of a charged capacitor:
(A) If a plate of dielectric constant k, thickness t is placed between the plates of a charged capacitor of area A and distance d, then the new capacitance will be \( \frac{A\varepsilon_0}{d - t(1 - 1/k)} \)
(B) The electric field between plates of the charged capacitor when the dielectric is introduced will be \( E = (E_0 - E_p) \)
(C) Dielectric constant of the dielectric placed between plates of charged capacitor will be \( k = \frac{E_0}{E_0 - E_p} \)
(D) Dielectric strength of the dielectric is the maximum value of the electric field which may be applied before its breakdown.
Choose the correct answer from the options given below :

The nuclear force is a short range force, this can be explained by fact that the binding energy per nucleon versus mass number curve:

The resistance of a cylindrical conductor is :

Which of the following statements are true regarding Lanthanoid elements?
i. \(\text{La}(\text{OH})_3\) is the basic hydroxide of Lanthanoids.
ii. \(\text{Zr}^{4+}\) and \(\text{Hf}^{4+}\) ions have almost similar ionic sizes.
iii. \(\text{Ce}^{4+}\) acts as an oxidising agent.
iv. Trivalent Lanthanoid ions are not coloured.
Choose the correct answer from the options given below:

Match List-I with List-II

List-I (Contraceptive methods)	List-II (Respective actions)
(A) Diaphragms	(I) Inhibit ovulation and implantation
(B) Contraceptive pills	(II) Increase phagocytosis of sperm within uterus
(C) Intra Uterine Devices	(III) Absence of menstrual cycle and ovulation following parturition
(D) Lactational amenorrhea	(IV) They cover the cervix blocking the entry of sperms

Choose the correct answer from the options given below:

Select the factor which does not affect Hardy-Weinberg Equilibrium?

Answer the question on the basis of passage given below :
Nitrogen differs from rest of the members of group 15 due to its small size, high electronegativity, high ionization enthalpy and non-availability of d orbitals. Nitrogen has unique ability to form pa - pa multiple bonds with itself and with other elements having small size and high electronegativity. Heavier elements of this group do not form pa - pr bonds as their atomic orbitals are so large and diffuse that they cannot have effective overlapping.
Arrange the following in decreasing order of their basic strength :
A. PH3 \(_3\)
B. \(AsH _3\)
C. \(NH _3\)
D. \(SbH _3\)
E. \(BiH _3\)
Choose the correct answer from the options given below:

About __________ the first cellular forms of life appeared on earth

Choose the incorrect statement.