List of practice Questions

A wire of resistance 5 ohms is stretched such that longitudinal strain is $200 \%$.The new resistance in ohms is
A slit of width 0.1 mm is illuminated normally d by light of $\lambda = 5000 \mathring A $. Diffraction bands are observed on a screen, 1 m away from the slit. Third dark band is at a distance x from the central maximum. x is approximately
RQ of germinating seeds of Pisum sativum is
What is the effect of dilution on the equivalent conductance of strong electrolyte?
$4$ moles each of $S O_{2}$ and $O_{2}$ gases are allowed to react to form $SO_{3}$ in a closed vessel. At equilibrium $25 \%$ of $O_{2}$ is used up. The total number of moles of all the gases present at equilibrium is
Motor neuron of a reflex arc carries impulse from
Girdling experiment is not successful in monocots due to
Oozing out of water drops from edges or tip is called
Two bars of radius r and 2rare kept in contact as shown. An electric current I is passed through the bars. Which one of following is correct ?
A galvanometer has a resistance $ 50\,\Omega $ . A resistance of $ 5\,\Omega $ is connected parallel to it. Fraction of the total current flowing through galvanometer is
What is the potential drop between points $A$ and $C$ in the following circuit? Resistances $ 1 \omega $ and $ 2 \omega $ are represent the internal resistance of the respective cells.
At the instant, when potentiometer is balanced, current
To decrease the range of an ammeter, its resistance need to be increased. An ammeter has resistance $ R_0 $ and range I. Which of the following resistance can be connected in series with it to decrease its range to $ \frac{1}{n} $ ?
A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold, then, an electric current will:
The current $I$ drawn from the $5$ volt source will be:
The resistance of a bulb filament is $100\, \Omega$ at a temperature of $100^?C$. If its temperature coefficient of resistance be $0.005$ per $^?C$, its resistance will become $200\,\Omega$ at a temperature of:
An electric bulb is rated 220 volt - 100 watt. The power consumed by it when operated on 110 volt will be :
A $5 \%$ solution (by mass) of cane sugar in water has freezing point of $271 \,K$ and freezing point of pure water is $273.15 \,K$. The freezing point of a $5 \%$ solution (by mass) of glucose in water is
The water pouch of instant cold pack for treating athletic injuries breaks when squeezed and $NH_4NO_3$ dissolves lowering the temperature. Addition of nonvolatile solute into solvent results into depression of freezing point of solvent.
$ 35.4\,\,mL $ of $ HCl $ is required for the neutralization of a solution containing $0.275 \,g$ of sodium hydroxide. The normality of hydrochloric add is?
Function $ x = A sin ^2 \omega t + B cos^ 2 \omega t + C sin \omega t cos \omega t $ represents SHM
The length of second's pendulum is 1 m on earth. If mass and diameter of a planet is doubled than that of earth, then its length becomes
What effect occurs on the frequency of a pendulum if it is taken from the earth's surface to deep into a mine?
A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency $\omega$ . The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time:
Amplitude of a pendulum is $60 \,mm$ and angular velocity is $2 \,rad\, s^{-1}$. Find its velocity if its displacement is $22 \,mm$: