List of practice Questions

The wrong statement regarding Galvanic cell is

Electrolysis of an aqueous solution of $Na_{2}SO_{4}$ between Pt electrodes liberate a gas X at anode and gas Y at cathode. X and Y respectively are}

According to Arrhenius theory of acids and bases, which of the following is an example of Arrhenius base?

100 mL of 0.1M $HCl$ and 100 mL of 0.05 M $H_{2}SO_{4}$ are mixed and the solution is diluted to 2.0 L by adding water. The pH of the resulting solution is

Identify the pair of gases which have same number of molecules at S.T.P?

Which of the following has highest equivalent weight? (Given: At.wt $H=1, C=12, O=16, S=32, Na=23, Ca=40$)

12.6 g of oxalic acid, $H_{2}C_{2}O_{4} \cdot 2H_{2}O$ (M.wt 126) is present in 1500 mL of solution. The normality of that solution is

Which one of the following statements is not correct?

In which of the following, the number of bonding electrons and non-bonding electrons are in 3:2 ratio?

The four quantum numbers for the electron in the outermost orbital of potassium ($Z=19$) are

The angular momentum of an electron in an orbit $X$ of hydrogen atom is $\frac{2h}{\pi}$. Maximum number of orbitals possible in $X$ is

The pair of orbitals with electron density maximum along the axes is

In a superconducting ring, a persistent current has been flowing without decay for years. This is possible because:

In Optical Fiber communication, the signal is transmitted in the form of:

In a photoelectric experiment, the stopping potential for incident light of wavelength 4000 Å is 2 V. If the wavelength is changed to 3000 Å, the new stopping potential will be approximately:

The R.M.S. speed of oxygen molecules at 27 °C is $v$. At 927 °C the rms speed will be:

A bubble of an ideal gas rises from the bottom of a lake to the surface. At the bottom, the pressure is 3 Atm. and the temperature is 7 °C. At the surface, the pressure is 1 atm. and the temperature is 27 °C. If the initial volume of the bubble was $V_0$ what is its volume $V_f$ at the surface?

At constant temperature, the product PV is plotted against pressure P for an ideal gas. The graph obtained is:

If the pressure of an ideal gas is doubled and its absolute temperature is halved; the volume will become:

In an Isothermal process:

In a closed hall of volume 5000 m³, the total absorption of the interior surfaces is 200 metric sabin. The reverberation time is:

If the volume of a room is doubled and the total absorption is halved, the reverberation time will:

In Acoustics, 'Noise' is generally characterized by:

A source of sound of frequency 500Hz is moving towards an observer with velocity $30m/s$. The speed of sound is $330m/s$. The frequency heard by the observer will be:

Two identical piano wires, when tuned to a fundamental frequency of 400 Hz, produce no beats. One wire is then slightly tightened, and the beat frequency heard is 2 Hz. What is the new fundamental frequency of the tightened wire?