Which of the following statement is NOT true, when two capacitors charged to different potential are connected in parallel by a conducting wire ?

Identify the correct statements among the following:
(A) An electromagnetic wave travels in vacuum like sound waves.
(B) An ultraviolet wave is not an electromagnetic wave.
(C) An electromagnetic wave can travel from earth to the planet, saturn.
(D) An electromagnetic wave may have less velocity in a medium than in vacuum.
Choose the correct answer from the options given below:

In a meter bridge experiment null point is obtained at 20 cm from one end when resistance X is balanced against resistance Y, where \( X < Y \). Then, the new position of the null point from the same end if X is replaced by 4X will be:

The radii of curvature of the two surfaces of a concave lens are 20 cm each. The refractive index of the material of the lens is 1.5. The power of the lens would be -

A message signal of peak voltage 20 V is used to modulate a carrier wave of amplitude 40 V in amplitude modulation. The ratio of maximum amplitude and minimum amplitude in amplitude modulated signal is:

Two slits are made 0.8 mm apart and the screen is placed 1.5 m away. What should be the width of each slit to obtain 8 maxima of the double slit pattern within the central maximum of the single slit pattern?

It is observed that only 25% of a given radioactive sample is left undecayed after 16 days. What is the decay constant of the sample in \(\text{day}^{-1}\)?

The random variable \(X\) can take values 0, 1, 2 . If \(P(X=0)=P(X=1)=\alpha\), and \(E\left(X^2\right)=E(X)\), then which of the following are correct?
\(E(X)=2-3 \alpha\)
\(E\left(X^2\right)=4+7 \alpha\)
\(\alpha=\frac{1}{2}\)
\(\alpha=\frac{1}{5}\)
Choose the correct answer from the options given below :

Nitrogen in trimethylamine is \No Solution(\mathrm{sp}^3\) hybridized. The C-N-C bond angle is \(108^{\circ}\). The geometry of trimethylamine is

Which of the following is NOT a property of charges?

In the following examples, select the primary alkyl halide
(A). 1-Bromo-3-methylbutane
(B). 2-Bromo-2-methylbutane
(C). 3-Bromo propene
(D). Chlorophenyl methane
Choose the correct answer from the options given below:

Read the passage carefully and answer the Questions:
Amines are classified as primary \(\left(1^{\circ}\right)\), secondary \(\left(2^{\circ}\right)\) and tertiary \(\left(3^{\circ}\right)\) depending upon the number of hydrogen atoms replaced by alkyl or aryl groups in ammonia molecules. Aliphatic amines are a stronger bases due to \(+I\) effect of an alkyl groups. Intermolecular hydrogen bonding in primary and secondary amines affects the boiling points of amines. The intermolecular association is more in primary amines than in secondary amines as there are more number of hydrogen atoms available for hydrogen bond formation. Nitro compounds are reduced to amines by passing hydrogen gas in the presence of finely divided nickel, palladium or platinum and also by reduction with metals in an acidic medium. Gabriel synthesis is used for the preparation of primary amines. Primary amines react with nitrous acid to give unstable diazonium-salts which can be used to synthesize a variety of compounds.
Identify the amine possessing least basic strength:

Which of the following statements are not correct?
A. Phenol is used to prepare analgesic drugs.
B. Solubility of phenol in water is more than that of chlorobenzene.
C. Phenol is neutralised by sodium carbonate.
D. Boiling point of o- nitrophenol is lower than that of p-nitrophenol.
Choose the most appropriate answer from the options given below: