List of practice Questions

A body of mass $5\, kg $ is moving with a momentum of $10\,kg\,m/s $ . A force of $ 0.2\,N $ acts on it in the direction of motion of the body for $10\, s$. The increase in its kinetic energy is
A thin circular ring of mass $ M $ and radius $ r $ is rotating about its axis with constant angular velocity $ \omega $ . Two objects each of mass $ m $ , are placed gently at the opposite ends of diameter of the ring. The ring now rotates with an angular velocity
$S_N2$ reaction readily occurs in
$\beta$-pleated sheet structure of protein shows maximum extension. Intermolecular hydrogen bonding is present in them.
The correct increasing order of reactivity for the following molecules towards electrophilic aromatic substitution is
The correct decreasing order of $pK_a$ is
Which of the following is an example of pleiotropy ?
Which one among the following is a poikilothermic animal
Which one of the following plants has bicollateral vascular bundles in its stem?
Who discovered transduction in bacteria?
Which hormone is responsible for ovulation?
When the same quantity of current is passed through $ {CuSO_4}$ and $ {AgNO_3}$ solution 2.7 g of silver is deposited. The amount of copper deposited is
Two lamps of powers $ {{P}_{1}} $ and $ {{P}_{2}} $ are placed on either side of a paper having an oil spot. The lamps are at distances of 1 m and 2 m respectively on either side of the paper and the oil spot is invisible. What is the value of $ {{P}_{1}}/{{P}_{2}} $ ?
A parallel plate capacitor of value 1.77 $ \mu $ F is to be designed using a dielectric material (dielectric constant = 200), breakdown strength of $ 3\times {{10}^{6}} $ V/m. In order to make such a capacitor which can withstand a potential difference of 20 V across the plates, the separation between the plates d and area A of the plates respectively are
On a massless rod four masses are fixed as shown in figure. What is the moment of inertia about an axis passing through centre of rod
The two waves, whose intensities are $ 9:16 $ are made to interfere. The ratio of maximum and minimum intensities in the interference pattern is
At what temperature is rms speed of air molecules double of that at NTP?
The rate of outflow of liquid through an orifice does not depend upon
What is the relation between particle velocity (v), the wave velocity (c) and the slope (s) of the wave?
A small object placed on a rotating horizontal turn-table just slips when it is placed at a distance of 4 cm from the axis of rotation. If the angular velocity of the turn-table is doubled the object slips when its distance from the axis of rotation is
A bullet moving with speed 200 m/s is just able to pierce a wooden block of 6 cm thickness. What velocity is required to just pierce a block of 8 cm?
A bullet of 5 g is fired with a velocity of 800 m/s. The velocity of bullet becomes 200 m/s when it pierces a wooden block 2 m thick. What is the average resistance offered by the wooden block?
Vermicompost is
Vermicompost is ecofriendly because
The pOH of 0.0005 M sulphuric acid is