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A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm will be
Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :
The centriole undergoes duplication during:
In which case is number of molecules of water maximum?
Which of the following pairs is wrongly matched?
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
In a certain region of space with volume $0.2 \text{ m}^3$, the electric potential is found to be $5 \text{ V}$ throughout. The magnitude of electric field in this region is :
Match the following and identify the correct option. (a) $CO(g) + H_2(g)$ (i) $Mg(HCO_3)_2 + Ca(HCO_3)_2$ (b) Temporary hardness of water (ii) An electron deficient hydride (c) $B_2H_6$ (iii) Synthesis gas (d) $H_2O_2$ (iv) Non-planar structure
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An alkene on ozonolysis gives methanal as one of the product. Its structure is
The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is $0.25 \ \Omega$. What will be the effective resistance if they are connected in series?
Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below: $\text{BrO}_4^- \xrightarrow{1.82 \text{V}} \text{BrO}_3^- \xrightarrow{1.5 \text{V}} \text{HBrO}$ and $\text{Br}^- \xleftarrow{1.0652 \text{V}} \text{Br}_2 \xleftarrow{1.595 \text{V}} \text{HBrO}$. Then the species undergoing disproportionation is
From a circular ring of mass 'M' and radius 'R' an arc corresponding to a 90° sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is 'K' times 'MR^2'. Then the value of 'K' is
Three resistors having resistances $r_1$, $r_2$ and $r_3$ are connected as shown in the given circuit. The ratio $\frac{i_3}{i_1}$ of currents in terms of resistances used in the circuit is
Match Column - I and Column - II and choose the correct match from the given choices. Column - I: (A) Root mean square speed of gas molecules, (B) Pressure exerted by ideal gas, (C) Average kinetic energy of a molecule, (D) Total internal energy of 1 mole of a diatomic gas. Column - II: (P) $\frac{1}{3}nm\bar{v}^2$, (Q) $\sqrt{\frac{3RT}{M}}$, (R) $\frac{5}{2}RT$, (S) $\frac{3}{2}k_BT$.
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?
The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on?
The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its plane to the radius of gyration of the disc about its diameter is
Which one among the following is the correct option for right relationship between $C_p$ and $C_v$ for one mole of ideal gas?
Match List-I with List-II. List-I: (a) $[Fe(CN)_6]^{3-}$, (b) $[Fe(H_2O)_6]^{3+}$, (c) $[Fe(CN)_6]^{4-}$, (d) $[Fe(H_2O)_6]^{2+}$. List-II: (i) 5.92 BM, (ii) 0 BM, (iii) 4.90 BM, (iv) 1.73 BM. Choose the correct answer from the options given below.