List of top Questions asked in AIIMS

A transformer with efficiency 80% works at $4\, kW$ and $100\, V$. If the secondary voltage is $200\,V$, then the primary and secondary currents are respectively

Which of the following statements is correct regarding menstrual cycle?

A neutron in a nuclear reactor collides head on elastically with the nucleus of a carbon atom initially at rest. The fraction of kinetic energy transferred from the neutron to the carbon atom is

Documented microfossils have been found that are as old as

The water logging capacity of garden soil will be determined by measuring the weight of

The figure shows different human tissues labelled as A to D. Which option gives the correct identification of the label, its location and one feature?

Some salient features and phyla of organisms are given below. Select the option which shows correct combination of organism, its phylum and salient features.

The process where a population inhibits the growth of other population without affecting itself is known as

Identify the incorrect statement about ABA growth regulator.

Match the tissues/molecules mentioned in column I with those of their degrading enzymes mentioned in column II and select the correct option from the given codes. $\quad$$\quad$Column I$\quad$$\quad$$\quad$ $\quad$Column II A. $\quad$Cell wall$\quad$$\quad$$\quad$ (i) $\quad$Proteases B. $\quad$RNA $\quad$$\quad$$\quad$$\quad$ (ii) $\quad$Pectinases C. $\quad$Histone $\quad$$\quad$$\quad$(iii) $\quad$Ribonucleases D. $\quad$Pectin$\quad$$\quad$$\quad$$\quad$ (iv) $\quad$Cellulase

Which of the following is not a factor that would limit the growth of a population?

Select the correct statement regarding reproduction.

When plants/animals are infected with virus, they may produce an anti-viral substance that is capable of inhibiting the multiplication of that virus. Identify the correct name of this substance.

A large quantity of urban sewage is drained into nearby village river. Which among the given conditions would happen after mixing of sewage into the river? (i) $\quad$Biochemical oxygen demand (BOD) of receiving water body increases. (ii)$\quad$ Dissolved oxygen of receiving water body decreases. (iii) $\quad$It will not cause mortality among fishes and other aquatic creatures. (iv) $\quad$It will lead to nutrient enrichment of receiving water body.

A circular coil of radius $10 \,cm$, $500\, turns$ and resistance $2 \,\Omega$ is placed with its plane perpendicular to the horizontal component of the earth?s magnetic field. It is rotated about its vertical diameter through 180$^{\circ}$ in $0.25\, s$. The current induced in the coil is (Horizontal component of the earth?s magnetic field at that place is $3.0 \times 10^{-5}$ T)

Select the option that correctly matches characteristic features with the group of three animals.

A wheel starts rotating from rest at time t = 0 with a angular acceleration of 50 radians/s. The angular acceleration ($\alpha$) decreases to zero value after 5 seconds. During this interval, $\alpha$ varies according to the equation $\alpha=\alpha_{0}\left(1-\frac{t}{5}\right)$ The angular velocity at t = 5 s will be

In an LCR circuit as shown in figure, both switches are open initially. Now switch S is closed, S kept open. (q is charge on the capacitor and $\tau$ = RC is capacitive time constant). Which of the following statement is correct?

Two chamber containing $m_1$ and $m_2$ grams of a gas at pressures $P_1$ and $P_2$ respectively are put in communication with each other, temperature remaining constant. The common pressure reached will be

Sphagnum is slowly carbonised, compressed and fossilised over thousands of years to produce a dark spongy mass called peat. Peat helps to keep soil porous and it also improves water holding capacity of the soil.

Unlike electric force and gravitational forces, nuclear force has limited range. Nuclear force do not obey inverse square law.

Chlorobenzene is more reactive than benzene towards the electrophilic substitution reaction. Resonance destabilises the carbocation.

In a 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would be the number of cytosine bases?

The magnetic field at the centre O of the arc shown in the figure is

Time period of pendulum, on a satellite orbiting the earth, is