List of practice Questions

Manipulation of DNA in genetic engineering became possible due to the discovery of :-
A 100 W bulb $B_1$ and two 60 W bulbs $B_2 \, and\, B_3$, are connected to a 250 V source, as shown in the figure. Now $W_1, W_2 \, and \, W_3$ are the output powers of the bulbs $B_1, B_2$ and $B_3$ respectively. Then,
If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter :
The resistivity of metal increases with increase in temperature because:
The normality of mixture obtained by mixing $100\, mL$ of $0.2\, M H _{2} SO _{4}$ and $200\, mL$ of $0.2 \,M\,HCl$ is :
A small block is connected to one end of a massless spring of unstretched length 4.9 m. The other end of the spring (see the figure) is fixed. The system lies on a horizontal frictionless surface. The block is stretched by 0.2 m and released from rest at t = 0. It then executes simple harmonic motion with angular frequency to = $\frac{\pi }{3}$ rad/s. Simultaneously at t = 0, a small pebble is projected with speed v from point P at an angle of 45$^{\circ}$ as shown in the figure. Point P is at a horizontal distance of 10 m from O. If the pebble hits the block at / = 1 s, the value of v is $ (take \, \, g = 10 m /s_2 $
When a graph is plotted between log K and $ \left( \frac{1}{T} \right), $ the slope of line obtained represents: (K = rate constant, T = temperature)
Consider the chemical reaction, $N_2(g)+3H_2(g)\rightarrow 2NH_3(g)$ .The rate of this reaction can be expressed in terms of time derivatives of concentration of $N_2(g), H_2(g) or NH_3(g)$. Identify the correct relationship amongst the rate expressions
For the reaction : $ {H2 + Cl2 ->[{\text{sunlight}}] 2HCl}$ the order of reaction is
Algae are useful because they
Megasporophyll of Cycas has the same nature as
Circinate vernation is present in
How many moles of electron weighs 1 kg?
Atoms can neither be created nor destroyed. Under similar condition of temperature and pressure, equal volume of gases does not contain equal number of atoms.
An electron having charge $e$ and mass $m$ is moving in a uniform electric field $E .$ Its acceleration will be
Which of the following molecular species has unpaired electron (s)?
If $(\omega\,\neq\,1)$ is a cube root of unity , then $ \begin{vmatrix} 1 &1+i+\omega^2 &\omega^2 \\[0.3em] 1-i&-1 & \omega^2-1 \\[0.3em] -i & -1+\omega-i& -1 \end{vmatrix}=$
A similarity between optical and geometrical isomerism is that
The ionic product of water increases if:
Consider the following equilibrium in a closed container $ N_2 O_4 \, (g) \rightleftharpoons 2NO_2 \, ( g) $ At a fixed temperature, the volume of the reaction container is halved. For this change, which of the following statements hold true regarding the equilibrium constant $ ( K_p ) $ and degree of dissociation $( \alpha)$ ?
A solution of an acid has pH = 4.70. Find out the number of $OH^-$ ions $(pK_w = 14)$
How do we differentiate between $Fe^{3+}$ and $Cr^{3+}$ in group III ?
The $pH$ of solution containing $0.10\, M$ sodium acetate and $0.03\, M$ acetic acid is $ \left( pK _{a} \text { for } CH _{3} COOH =4.57\right) $
A torque of $30 \,N-m$ is acting on a wheel of mass $5 \,kg$ and moment of inertia $2\, kg-m2$. If wheel starts rotating from rest then, its angular displacement in $10 $ seconds will be:
A body projected with an initial velocity horizontally has kinetic energy K. If it is projected at an angle $ 45{}^\circ $ the initial kinetic energy will be: