A potentiometer wire of length \(L\) and a resistance \(r\) are connected in series with a battery of EMF \(E_{0 }\) and resistance \(r_{1}\). An unknown EMF is balanced at a length l of the potentiometer wire. The EMF \(E\) will be given by:
1. \(\frac{L E_{0} r}{l r_{1}}\)
2. \(\frac{E_{0} r}{\left(\right. r + r_{1} \left.\right)} \cdot \frac{l}{L}\)
3. \(\frac{E_{0} l}{L}\)
4. \(\frac{L E_{0} r}{\left(\right. r + r_{1} \left.\right) l}\)
Young’s modulus of steel is twice that of brass. Two wires of the same length and of the same area of cross-section, one of steel and another of brass, are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weights added to the steel and brass wires must be in the ratio of:
1. \(1:2\)
2. \(2:1\)
3. \(4:1\)
4. \(1:1\)
The input signal given to a CE amplifier having a voltage gain of 150 is . The corresponding output signal will be:
1.
2.
3.
4.
An automobile moves on a road with a speed of \(54~\text{kmh}^{-1}.\) The radius of its wheels is \(0.45\) m and the moment of inertia of the wheel about its axis of rotation is \(3~\text{kg-m}^2.\) If the vehicle is brought to rest in \(15\) s, the magnitude of average torque transmitted by its brakes to the wheel is:
1. \(6.66~\text{kg-m}^2\text{s}^{-2}\)
2. \(8.58~\text{kg-m}^2\text{s}^{-2}\)
3. \(10.86~\text{kg-m}^2\text{s}^{-2}\)
4. \(2.86~\text{kg-m}^2\text{s}^{-2}\)
In which of the following pairs, both the species are not isostructural?
1. \(\mathrm{SiCl}_4, \mathrm{PCl}_4^{+}\)
2. Diamond, silicon carbide
3. \(\mathrm{NH}_3, \mathrm{PH}_3\)
4. \(\mathrm{XeF}_4, \mathrm{XeO}_4\)
The esters that get hydrolyzed most easily under alkaline conditions is?
1. | |
2. | |
3. | |
4. |
The reaction of phenol with chloroform in the presence of dilute sodium hydroxide finally introduces a functional group X. The X is:
1. -CH2Cl
2. -COOH
3. -CHCl2
4. -CHO
Alkyl halides prepared by among the following reaction(s) is/are:
I. | \(CH_3CH_2OH+HCl\xrightarrow{\bf{anh. ZnCl_2}}\) |
II. | \(CH_3CH_2OH+HCl→\) |
III. | \((CH_3)_3COH+HCl→ \) |
IV. | \((CH_3)_2CHOH+HCl\xrightarrow{\bf{anh.ZnCl_2}}\) |
1. | I, III, and IV | 2. | I and II |
3. | Only IV | 4. | III and IV |
The correct statement about the SN1 reaction is:
1. | 100 % racemisation. |
2. | Inversion more than retention leads to partial racemisation. |
3. | 100 % retention. |
4. | 100 % Inversion. |
Which of the following is not the product of dehydration of?
1. | 2. | ||
3. | 4. |