| 2023-06-19 | The first emission line of Balmer series in \( \mathrm{H} \) spectrum has the wave number equal ... | 2:19 | 0 | |
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| 2023-06-19 | If the series limit of wavelength of the Lyman series for the hydrogen atoms in \( 912 \AA \), t... | 4:19 | 2 | |
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| 2023-06-19 | Which of the following statement is not true?
(a) Lyman spectral series of hydrogen atom lies in... | 2:34 | 1 | |
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| 2023-06-19 | The spectral lines corresponding to the radiation emitted by an electron jumping from higher orb... | 1:52 | 1 | |
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| 2023-06-19 | For the Paschen series, the value of \( \mathrm{n}_{1} \) and \( \mathrm{n}_{2} \) in the expres... | 1:34 | 2 | |
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| 2023-06-19 | In a sample of \( \mathrm{H} \)-atom electrons make transition from \( 5^{\text {th }} \) excite... | 3:13 | 2 | |
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| 2023-06-19 | If \( r_{1} \) is the radius of the first orbit of hydrogen atom, then the radii of second, thir... | 3:13 | 5 | |
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| 2023-06-19 | The ratio of the radius of Bohr first orbit for the electron orbiting the hydrogen nucleus to th... | 3:55 | 2 | |
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| 2023-06-19 | An electron in \( \mathrm{H} \)-atom in its ground state absorbs 1.50 times as much as energy as... | 2:32 | 1 | |
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| 2023-06-19 | Bohrs theory is not valid for the species:
(a) \( \mathrm{H} \) atom
(b) \( \mathrm{He}^{+} \)io... | 2:15 | 0 | |
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| 2023-06-19 | Energy of Bohr orbit:
(a) Increases as we move away from the nucleus.
(b) Decreases as we move a... | 2:30 | 4 | |
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| 2023-06-19 | \( \mathbf{S}_{1} \) : Potential energy of the two opposite charge system increases with the dec... | 7:08 | 1 | |
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| 2023-06-19 | Which of the following electron transitions in hydrogen atom will require largest amount of ener... | 3:16 | 4 | |
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| 2023-06-19 | If the velocity of an electron in the first Bohr orbit of a hydrogen atom is \( \mathrm{V} \), t... | 2:19 | 1 | |
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| 2023-06-19 | \( \mathrm{E}_{\mathrm{n}}=-313.6 / \mathrm{n}^{2} \mathrm{kcal} / \mathrm{mol} \). If the value... | 1:27 | 0 | |
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| 2023-06-19 | The radius of the first orbit of \( \mathrm{H} \)-atom is \( \mathrm{r} \). Then, the radius of ... | 2:43 | 0 | |
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| 2023-06-19 | According to Bohr theory, the angular momentum for an electron of 5 th orbit is:
(a) \( 5 \mathr... | 1:41 | 11 | |
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| 2023-06-19 | Which is the correct relationship:
(a) \( \mathrm{E}_{1} \) of \( \mathrm{H}=1 / 2 \mathrm{E}_{2... | 5:00 | 1 | |
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| 2023-06-19 | If velocity of an electron in \( 1^{\text {st }} \) orbit of \( \mathrm{H} \) atom is \( \mathrm... | 2:15 | 3 | |
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| 2023-06-19 | Light of wavelength \( \lambda \) falls on metal having work function \( \mathrm{hc} / \lambda_{... | 3:28 | 2 | |
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| 2023-06-19 | When the frequency of light incident on a metallic plate is doubled above threshold frequency, t... | 4:18 | 0 | |
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| 2023-06-19 | A \( 600 \mathrm{~W} \) mercury lamp emits monochromatic radiation of wavelength \( 331.3 \mathr... | 3:59 | 0 | |
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| 2023-06-19 | A bulb of \( 40 \mathrm{~W} \) is producing a light of wavelength \( 620 \mathrm{~nm} \) with \(... | 5:29 | 1 | |
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| 2023-06-19 | Photoelectric effect can be explained by assuming that light:
(a) Is a form of transverse wave.
... | 2:16 | 2 | |
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| 2023-06-19 | Prove that \( a^{2}+b^{2}+c^{2}-a b-b c-a c \) is non-negative for all real values of \( a, b \)... | 5:16 | 1 | |
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| 2023-06-19 | A light whose frequency is equal to \( 6 \times 10^{14} \mathrm{~Hz} \) is incident on a metal w... | 4:21 | 2 | |
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| 2023-06-19 | Electromagnetic radiations of wavelength \( 242 \mathrm{~nm} \) is just sufficient to ionise Sod... | 4:37 | 0 | |
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| 2023-06-19 | The highest value of e \( / \mathrm{m} \) of anode rays has been observed when the discharge tub... | 2:59 | 0 | |
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| 2023-06-19 | The MRI (magentic resonance imaging) body scanners used in hospitals operate with \( 400 \mathrm... | 2:22 | 3 | |
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| 2023-06-19 | Sometimes it is convenient to construct a system of units so that all quantities can be expresse... | 6:17 | 1 | |
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| 2023-06-19 | Number of real solution of \( \log _{5}\left[2+\log _{3}(x+3)\right]=0 \) is | 5:24 | 2 | Vlog |
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| 2023-06-19 | Atomic number of an element represents:
(a) Number of neutrons in the nucleus.
(b) Atomic mass o... | 1:16 | 1 | |
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| 2023-06-19 | If \( \log _{x-3}(2 x-3) \) is a meaningful quantity then find the interval in which \( x \) mus... | 2:22 | 0 | Vlog |
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| 2023-06-19 | Number of cyphers after decimal before a significant figure starts in \( \left(\frac{5}{4}\right... | 5:17 | 1 | |
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| 2023-06-19 | \( \left[\left\{\left(\frac{1}{7^{2}}\right)^{-2}\right\}^{-1 / 3}\right]^{1 / 4}=7^{x} \) then ... | 2:40 | 7 | |
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| 2023-06-19 | Solve the following inequalities: (i) \( \log _{x}(4 x-3) \geq 2 \) | 7:09 | 1 | Vlog |
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| 2023-06-19 | If \( a, b, c \) are real and \( a^{2}+16 b^{2}+25 c^{2}-4 a b-20 b c-5 a c=0 \) then find the r... | 4:51 | 3 | |
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| 2023-06-19 | If \( x+\frac{1}{x}=\sqrt{5} \) then find
(i) \( x^{2}+\frac{1}{x^{2}} \)
(ii) \( x^{3}+\frac{1}... | 2:39 | 15 | |
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| 2023-06-19 | If \( x=\sqrt[3]{7+5 \sqrt{2}}-\frac{1}{\sqrt[3]{7+5 \sqrt{2}}} \), then the value of \( x^{3}+3... | 4:13 | 7 | |
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| 2023-06-19 | The value of \( x+y+z \) satisfying the system of equations \( \log _{2} x+\log _{4} y+\log _{4}... | 14:25 | 0 | Vlog |
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| 2023-06-19 | Prove that \( (a-b)^{3}+(b-c)^{3}+(c-a)^{3}=3(a-b)(b-c) \) \( (c-a) \) | 3:44 | 0 | |
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| 2023-06-19 | If \( x^{2}+\frac{1}{x^{2}}=102 \), then possible values of \( x-\frac{1}{x} \) will be | 1:51 | 1 | |
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| 2023-06-19 | \( a+b+c=10 \) and \( a b+b c+a c=20 \) then find the value of \( a^{3}+b^{3}+c^{3}-3 a b c \) | 2:44 | 1 | |
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| 2023-06-19 | If \( a+b+c=1, a^{2}+b^{2}+c^{2}=9, a^{3}+b^{3}+c^{3}=1 \), then find value of \( \frac{1}{a}+\f... | 4:21 | 1 | |
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| 2023-06-19 | If \( N=7^{\log _{49} 900}, A=2^{\log _{2} 4}+3^{\log _{2} 4}+4^{\log _{2} 2}-4^{\log _{2} 3} \)... | 8:46 | 1 | Vlog |
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| 2023-06-19 | Solve for \( x \) : (i) \( \frac{\log _{10}(x-3)}{\log _{10}\left(x^{2}-21\right)}=\frac{1}{2} \) | 4:31 | 0 | Vlog |
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| 2023-06-19 | Solve for \( x \) : (i) \( \log _{2}\left(\log _{1 / 2}(x)\right)2 \) | 4:53 | 3 | Vlog |
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| 2023-06-19 | \( \log _{7}\left(\frac{2 x-6}{2 x-1}\right)0 \) | 6:27 | 1 | Vlog |
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| 2023-06-19 | \( \log _{1 / 5} \frac{4 x+6}{x} \geq 0 \) | 7:14 | 3 | Vlog |
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| 2023-06-19 | If \( \log _{2}\left(\log _{3}\left(\log _{4}(x)\right)\right)=0 \) and \( \log _{3}\left(\log _... | 4:49 | 1 | Vlog |
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| 2023-06-19 | \[ \log _{3}|3-4 x|2 \] Anter | 4:51 | 0 | Vlog |
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| 2023-06-19 | Solve for \( x: \log 4+\left(1+\frac{1}{2 x}\right) \log 3=\log \left((3)^{1 / x}+27\right) \) | 6:02 | 1 | Vlog |
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| 2023-06-19 | Match the following columns.
(a) \( A \longrightarrow s, B \longrightarrow p, C \longrightarrow ... | 15:30 | 2 | |
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| 2023-06-19 | Number of non-negative integral values of \( x \) satisfying the inequality \( \frac{2}{x^{2}-x+... | 8:02 | 5 | |
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| 2023-06-19 | Simplify:
(i) \( \frac{81^{\frac{1}{\log _{5} 9}}+3^{\frac{3}{\log _{\sqrt{6}} 3}}}{409}\left((\... | 4:58 | 0 | Vlog |
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| 2023-06-19 | Suppose \( x, y, z0 \) and different than one and \( \ln x+\ln y+ \) \( \ln z=0 \). Find the val... | 9:15 | 1 | |
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| 2023-06-19 | Find the value of the expression \( \frac{2}{\log _{4}(2000)^{6}}+\frac{3}{\log _{5}(2000)^{6}} \). | 3:11 | 1 | Vlog |
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| 2023-06-19 | Let \( \log _{2} x+\log _{4} x+\log _{8} x=\log _{k} x \) for all \( x \in R^{+} \). If \( k=\sq... | 6:17 | 0 | Vlog |
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| 2023-06-19 | The number of the integral solutions of \( x^{2}+9(x+3)^{2} \) \( 8 x+25 \) is:
(a) 1
(b) 3
(c) ... | 6:53 | 0 | |
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| 2023-06-19 | The complete solution of \( \frac{x^{2}-1}{x+3} \geq 0 \& x^{2}-5 x+2 \leq 0 \) is:
(a) \( x \in... | 8:59 | 0 | |
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| 2023-06-19 | Consider the quadratic equation, \( \left(\log _{10} 8\right) x^{2}-\left(\log _{10} 5\right) x ... | 9:12 | 1 | Vlog |
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| 2023-06-19 | The number of real solution/s of the equation \( 9^{\log _{3}\left(\log _{e} x\right)} \) \( =\l... | 4:51 | 0 | Vlog |
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| 2023-06-19 | If \( x+y=a \) and \( x^{2}+y^{2}=b \), then the value of \( \left(x^{3}+y^{3}\right) \) is
(a) ... | 2:54 | 0 | |
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| 2023-06-19 | If \( x+y+z=0 \), then a factor of the expression \( (x+y)^{3}+ \) \( (y+z)^{3}+(z+x)^{3} \) is
... | 4:15 | 2 | |
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| 2023-06-19 | If \( 2 x^{3}-5 x^{2}+x+2=(x-2)\left(a x^{2}-b x-1\right) \), then \( a \& b \) are respectively... | 3:15 | 6 | |
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| 2023-06-19 | The value of \( b \) satisfying thee quation, \( \log _{e} 2 \cdot \log _{b} 625 \) \( =\log _{1... | 4:15 | 0 | Vlog |
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| 2023-06-19 | The ratio \( \frac{2^{\log _{2_{1 / 4}} a}-3^{\log _{27}\left(a^{2}+1\right)^{3}}-2 a}{7^{4 \log... | 4:21 | 1 | Vlog |
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| 2023-06-19 | The set of all solutions of the inequality \( (1 / 2)^{x^{2}-2 x}1 / 4 \) contains the set
(a) \... | 2:44 | 1 | |
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| 2023-06-19 | The smallest integral value of \( x \) such that \( \sqrt{x+2}-\sqrt{x-2}\frac{1}{10} \) is
(a) ... | 5:28 | 10 | |
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| 2023-06-19 | The solution set of the system of equation \( \log _{3} x+\log _{3} y=2 \) \( +\log _{3} 2 \) an... | 4:56 | 1 | Vlog |
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| 2023-06-19 | \( 10^{\log _{p}\left(\log _{q}\left(\log _{r} x\right)\right)}=1 \) and \( \log _{q}\left(\log ... | 4:56 | 5 | Vlog |
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| 2023-06-19 | Which one of the following is the smallest?
(a) \( \log _{10} \pi \)
(b) \( \sqrt{\log _{10} \pi... | 3:43 | 3 | Vlog |
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| 2023-06-19 | Which is the correct order for a given number \( \alpha, \alpha1 \)
(a) \( \log _{2} \alpha\log ... | 4:05 | 1 | Let's Play |
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| 2023-06-19 | Let \( 3^{a}=4,4^{b}=5,5^{c}=6,6^{d}=7,7^{e}=8 \) and \( 8^{f}=9 \). The value of the product (a... | 7:48 | 2 | |
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| 2023-06-19 | If \( a, b, c \in R \) and \( a, b, c \neq 0 \) such that \( \frac{a}{b}+\frac{b}{c}+\frac{c}{a}... | 6:43 | 0 | |
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| 2023-06-19 | If \( n, k \in N \), then the smallest value of \( k \) such that \( k+2 k+3 k \ldots 24 k=n^{3}... | 3:31 | 2 | |
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| 2023-06-19 | If \( 3^{x}=5^{y} \), then how many ordered pairs \( (x, y), x, y \in R \) satisfy the given equ... | 2:10 | 2 | |
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| 2023-06-19 | The number of zeros after decimal before the start of any significant digit in the number \( N=(... | 5:51 | 1 | |
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| 2023-06-19 | Number of values of \( x \) satisfying the equation \( x^{4}=|x|^{\log _{2}\left(x^{2}+12\right)... | 3:20 | 1 | Vlog |
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| 2023-06-19 | There are two positive solutions to the equation \( \log _{2 x} 2+ \) \( \log _{4} 2 x=-\frac{3}... | 5:04 | 1 | Vlog |
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| 2023-06-19 | For a real gas at \( 25^{\circ} \mathrm{C} \) temperature and high pressure \( (99 \) bar), the ... | 8:38 | 0 | |
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| 2023-06-19 | Number of real value of \( x \) satisfying the equation \( \log _{2}\left(2 x^{2}+\sqrt{2}\right... | 2:15 | 0 | Vlog |
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| 2023-06-19 | If \( a^{x}=\sqrt{b}, b^{y}=\sqrt[3]{c} \) and \( c^{z}=\sqrt{a} \) then the value of \( x y z \... | 3:25 | 0 | |
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| 2023-06-19 | Solve the equation \( \frac{3 x^{4}+x^{2}-2 x-3}{3 x^{4}-x^{2}+2 x+3}=\frac{5 x^{4}+2 x^{2}-7 x+... | 6:10 | 0 | |
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| 2023-06-19 | A sealed flask with a capacity of \( 2 \mathrm{dm}^{3} \) contains \( 11 \mathrm{~g} \) of propa... | 10:53 | 2 | |
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| 2023-06-19 | The number of prime numbers satisfying the inequality \( \frac{x^{2}-1}{2 x+5}3 \) is
(a) 1
(b) ... | 3:02 | 0 | |
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| 2023-06-19 | If \( \frac{\log a}{b-c}=\frac{\log b}{c-a}=\frac{\log c}{a-b} \), then \( a^{a} \cdot b^{b} \cd... | 4:02 | 0 | Vlog |
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| 2023-06-19 | If \( x, y, z \) are positive real number and \( a, b, c \) are rational numbers, then the value... | 3:08 | 1 | |
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| 2023-06-19 | A mixture of hydrogen and oxygen contains \( 40 \% \) hydrogen by mass when the pressure is 2.2 ... | 11:29 | 4 | |
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| 2023-06-19 | Number of real solution \( (x) \) of the equation \( |x-3|^{3 x^{2}-10 x+3} \) \( =1 \) is
(a) e... | 2:58 | 3 | |
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| 2023-06-19 | A rigid nitrogen tank stored inside a laboratory has a pressure of \( 30 \mathrm{~atm} \) at 06:... | 4:59 | 0 | |
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| 2023-06-19 | The expression \( x^{2}-y^{2}-z^{2}+2 y z+x+y-z \) has a factor
(a) \( x-y+z+1 \)
(b) \( -x+y+z ... | 1:52 | 0 | |
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| 2023-06-19 | At \( 300 \mathrm{~K} \), a sample of \( 3.0 \mathrm{~g} \) of gas A occupies the same volume as... | 10:43 | 8 | |
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| 2023-06-19 | Simplify: \( 7^{\log _{3} 5}+3^{\log _{5} 7}-5^{\log _{3} 7}-7^{\log _{5} 3} \)
(a) 0
(b) 1
(c) ... | 1:28 | 0 | Vlog |
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| 2023-06-19 | Two identical vessels are connected by a tube with a valve letting the gas to pass from one vess... | 7:02 | 3 | |
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| 2023-06-19 | A vessel of volume \( 3.0 \mathrm{~L} \) contains ideal gas at the temperature \( 0^{\circ} \mat... | 6:58 | 2 | |
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| 2023-06-19 | Air is trapped in a horizontal glass tube by \( 40 \mathrm{~cm} \) mercury column as shown below... | 5:30 | 2 | Show |
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| 2023-06-19 | An iron meteorite was analysed for its isotopic argon content. The amount of \( \mathrm{Ar}^{36}... | 4:04 | 0 | |
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| 2023-06-19 | Match the columns \& choose the correct option among the options given.
(Note: Each statement in... | 9:35 | 0 | |
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| 2023-06-19 | Match the description in Column-I with graph in Column-II for \( n \) moles of an ideal gas at... | 8:36 | 1 | |
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