List of top Questions asked in DUET

In Tollens test, aldehydes
In plant biotechnology, PEG is used in
In a reverse-biased $p-n$ function, When the applied bias voltage is equal to the breakdown voltage, then
How many bio-geographical regions are present in India?
The reduced mass of two particles having masses $m$ and $2\, m$ is
The longitudinal wave can be observed in
Which of the following principles is being used in Sonar Technology?
When an $AC$ voltage is applied to a $L-C-R$ circuit, which of following is true ?
A body of mass $M$ starts sliding down on the inclined plane where the critical angle is $\angle ACB = 30^{\circ}$ as shown in figure. The coefficient of kinetic friction will be
The mean free path of collision of gas molecules varies with its diameter $(d)$ of the molecules as
In optical fibres, the refractive index of the core is
Darwin judged the fitness of an individual by
Decreasing order of reactivity of hydrogen halide acids in the conversion of $ ROH\to RX $ is
In the conversion of
A child travelling in a train throws a ball outside with a speed $v$. According to a child who is standing on the ground, the speed of the ball is
If $ 10^{10} $ electrons are acquired by a body every second, the time required for the body to get a total charge of $1 \,C$ will be
An electric motor operating on $15\,V$ supply draws a current of $5 \,A$ and yields mechanical power of $60 \,W$. The energy lost as heat in one hour (in $ kJ$ ) is
The magnitude and direction of current $ I $ (in $A$) Indicated in the following circuit is
A ball with charge $50 \,e$ is placed at the centre of a hollow spherical shell which has a net charge of $- 50\,e$ . What is the charge on the shells outer surface?
Band gap of silicon is E$_g$ (Si) of germanium is E$_g$ (Ge) and of carbon is E$_g$ (C). The correct order of band gap is
The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed as
Egg apparatus consists of
The example of pivot joint is
A point mass is placed inside a thin spherical shell of radius $ H $ and mass $ M $ at a distance $R/2$ from the centre of the shell. The gravitational force exerted by the shell on the point mass is.
A body of mass $M$ at rest explodes into three pieces, two of them of mass $M/4$ each, are thrown off in perpendicular directions with velocities of $3\, m/s$ and $4 \,m/s$ respectively. The third piece will be thrown off with a velocity of