Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
The intensity at the maximum in Young's double-slit experiment is $I_0$ when the distance between two slits is $d=5\lambda$, where $\lambda$ is the wavelength of light used in the experiment. What will be the intensity in front of one of the slits on the screen placed at a distance $D= 10d$?
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be:
Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?
The SI unit of universal gas constant (R) is
The half-life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to $(1/16)^{th}$ of its initial value?
The ratio of nuclear densities and nuclear volumes of ${}_{26}^{56}\mathrm{Fe}$ and ${}_{2}^{4}\mathrm{He}$ are, respectively:
At any instant, two elements $X_1$ and $X_2$ have the same number of radioactive atoms. If the decay constants of $X_1$ and $X_2$ are $10\lambda$ and $\lambda$ respectively, then the time when the ratio of their atoms becomes $1/e$ will be:
Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?
When gene targetting involving gene amplification is attempted in an individual's tissue to treat disease, it is known as :
Which of the following gate is called the universal gate?
Which one of the following equations of motion represents simple harmonic motion? (where $k, k_0, k_1$ and $a$ are all positive.)
A rectangular block of mass $m$ and area of cross-section $A$ floats in a liquid of density $\rho$. If it is given a small vertical displacement from equilibrium, it undergoes oscillation with a time period $T$. Then:
A particle of mass $m$ is released from rest and follows a parabolic path as shown. Assuming that the displacement of the mass from the origin is small, which graph correctly depicts the position of the particle as a function of time?
Which of the following is not an application of PCR (Polymerase Chain Reaction)?
The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is:
The average velocity of a particle executing SHM in one complete vibration is:
If in a p-n junction, a square input signal of $10\text{ V}$ is applied as shown, then the output across $R_L$ will be:
The given graph represents the $V$-$I$ characteristics of a semiconductor device. Which of the following statements is correct?
The amount of energy required to form a soap bubble of radius $2 \text{cm}$ from a soap solution is nearly (surface tension of soap solution $= 0.03 \text{N m}^{-1}$)
Which of the following are not secondary metabolites in plants?