This online mock test covers the following chemistry practice questions with bilingual explanations, negative marking schemes, and interactive CBT interface. Students searching for these topics can practice the complete test online with real-time timers:

1. What is the quark structure of Ω¯ baryon? (where s, u and d represent different 'flavours' of quarks) Ω¯ Baryon (Spin 3/2, S = -3) s s s Quark charges: (-1/3e) + (-1/3e) + (-1/3e) = -1e Quark Composition: sss
2. Which particular symmetry holds for all fundamental reactions? (Consider: C= Charge, P=Parity, T= Time reversal)
3. The liquid drop model for nucleus gives :
4. If the wavelength of the first line of the Balmer series in the hydrogen spectrum is \(\lambda\) then, what will be the wavelength of the first line of the Paschen series?
5. The radius of Ho is 7.731 Fermi. The radius of He is approximately :
6. What will be the energy of the photon emitted in the decay: \(\Sigma^{\circ}=\wedge^{\circ}+\gamma\) (Mass of \(\wedge^{\circ}=1116\text{ MeV}\), Mass of \(\Sigma^{\circ}=1190\text{ MeV}\))
7. Which of the following reaction/s can occur? (A) \(\wedge^{\circ}\rightarrow\pi^{+}+\pi^{-}\) (B) \(\pi^{-}+p\rightarrow n+\pi^{\circ}\) (C) \(\pi^{+}+p\rightarrow\pi^{+}+p+\pi^{-}+\pi^{\circ}\) (D) \(\gamma+n\rightarrow\pi^{+}+p\)
8. Consider the following pairs. Which pair/s is/are not correctly matched? (I) 1 curie (Ci) = \(3.7\times 10^{10}\) disintegration/sec. (II) 1 milli curie (mCi) = \(3.7\times 10^{6}\) disintegration/sec. (III) 1 rutherford (Rd) = \(10^{6}\) disintegration/sec. (IV) 1 becquerel (Bq) = 1 disintegration/sec.
9. The correct equation/s for \(\beta\)-decay is/are: (A) \(n\rightarrow p+e^{-}+v_{e}\) (B) \(n\rightarrow p+e^{-}+\bar{\nu}_{e}\) (C) \(n\rightarrow p+e^{+}+v_{e}\) (D) \(n\rightarrow p+e^{+}+\bar{v}_{e}\)
10. Choose the correct option. The meson theory of nuclear forces suggest that : (A) Van der Waals forces are limited to very short range. (B) These forces do not have inverse square dependence.
11. The surface energy term of liquid drop model of nucleus is expressed as:
12. The interaction potential energy between two quarks separated by a distance r inside a nucleon can be described by:
13. Electric charge of quark can be expressed as: (A) \(Q=+\frac{4}{3}e\) (B) \(Q=-\frac{5}{3}e\) (C) \(Q=-\frac{1}{3}e\) (D) \(Q=+\frac{2}{3}e\)
14. What is the Larmor frequency of a proton in magnetic field of 1 tesla?
15. Binary number \((1101111)_{2}\) is equivalent to which decimal number?
16. A PN junction diode cannot be used as :
17. A junction transistor has \(r_{e}=50~\Omega\), \(r_{b}=1~k\Omega\), \(r_{c}=1~M\Omega\) and \(\alpha=0.98\). If it is used in common base configuration, then its input resistance is :
18. Which one of the following is an example of a lepton?
19. The weak interaction is mediated by which?
20. The correct Boolean identity of \((A+B)(A+C)\) is:
21. Octal equivalent of \((8DF9)_{16}\) is:
22. Consider the following pairs. Which pair(s) is/are correct? (I) AND Gate (II) NOR Gate (III) NOT Gate (IV) NAND Gate (I) AND Gate [Incorrect symbol: OR] (II) NOR Gate [Incorrect: NAND] (III) NOT Gate [Correct match] (IV) NAND Gate [Correct match]
23. In a common emitter transistor characteristic, leakage current is due to :
24. Consider the following equations : (I) \(\overline{A}+\overline{B}+\overline{C}=\overline{A\cdot B\cdot C}\) (II) \(\overline{A}+\overline{B}+\overline{C}=\overline{A+B+C}\) (III) \(\overline{A\cdot B\cdot C}=\overline{A}+\overline{B}+\overline{C}\) (IV) \(\overline{A\cdot B\cdot C}=\overline{A+B+C}\)
25. Consider the following pairs: (I) Adding pentavalent impurity to intrinsic semiconductor -> N-type (II) Adding impurities -> Doping (III) Electrical conductivity decreases if temperature increases -> False for semiconductors (IV) In P-N-P transistor, N-type crystal acts like -> Emitter
26. Consider the following truth-table for XOR Gate, \(Y=A\oplus B\): Which row/s of the truth-table is/are correct?XOR Gate Symbol & Truth Table (Y = A ⊕ B) A B Y Y = A'B + AB' Row A B Y (I) 0 0 0 (II) 0 1 1 (III) 1 0 1 (IV) 1 1 0
27. For the logic circuit given below, which of the following option is not correct?Logic Circuit A B AND OR C C = (A · B) + B = B
28. In the following circuit, how much current is drawn from the cell and potential drop occurs across diode \(D_{2}\)?Diode Circuit + - 2 V 10 Ω D₁ (Forward) 10 Ω D₂ (Reverse) 10 Ω I = 0.1 A
29. In the following circuit, the minimum value of resistance \(R_{S}\) that keeps the zener diode safe is:Zener Diode Voltage Regulator Circuit + - Vᵢₙ = 12 V Rˢ V_z = 5 V P = 0.5 W I_z(max) = 0.1 A V_out = 5 V
30. The load current in the transmitting antenna of an unmodulated AM transmitter is 6 Amp. What will be the antenna current when modulation is 60%?
31. Which of the following is responsible for bringing communication and information technology together?
32. The basic element/s of any communication system is/are :
33. A transistor is being used at \(25^{\circ}C\) with common base amplifier configuration. Emitter current is 2 mA and base current is 40 \(\mu\text{A}\). The collector current and current gain will be :
34. In a negative feedback amplifier, the gain \(A_{V}\) of amplifier is 12000. If the feedback factor is 0.05, the closed loop gain \(A_{f}\) of the amplifier circuit will be :
35. What are the three essential and fundamental elements of any communication system?
36. When compared to an analog signal carrying the same information, a digital signal usually needs:
37. When radio waves travel through atmosphere, which layer is mainly responsible of reflecting them back to earth?
38. What is the main reason that a communication network is necessary?
39. If the bandwidth of a signal is 5 kHz and the lowest frequency is 52.0 kHz, what is the highest frequency?
40. Which protocol is primarily used for sending emails?
41. The critical temperature of lead is 7.2 K. What is the binding energy of its cooper pairs at zero temperature?
42. In a perfect ionic crystal, which type of defects dominate?
43. The Hall coefficient of an n-type semiconductor is:
44. The total efficiency of an injection laser with a GaAs active region is 18%. The voltage applied is 2.5 V and band gap energy of GaAs is 1.43 eV. The external power efficiency of the device is :
45. What does DHCP do on a network?
46. If a material is transformed into a superconducting state from a normal state, its entropy:
47. A simple cubic (SC) crystal has lattice constant \(a=0.3\text{ nm}\). The interplanar spacing for the (111) plane is
48. An insulator has an optical absorption below 1800 Å. The width of forbidden energy gap is:
49. According to the BCS theory of superconductivity, what is threshold energy of an excitation required to break a Cooper pair?
50. Compare the density of lattice planes in (132) plane with that in (100) planes for a cubic primitive lattice:
51. What is the packing fraction of a face centered cubic (FCC) structure?
52. The power radiated by Sun is \(3.8\times 10^{26}\) watt and radius of Sun is \(7\times 10^{8}\) m. The average value of Poynting vector is -
53. The energy per unit time and per unit area transported by the electromagnetic field is called –
54. The Maxwell's electromagnetic equations are valid under the following conditions except one, which is -
55. The amplitude of the electric field in a parallel beam of light of intensity \(2.0\text{ watt/m}^{2}\) will be -
56. Speed of electromagnetic wave in vacuum is same - (A) for all wavelengths (B) in all mediums (C) for all intensities (D) for all frequencies
57. A dielectric medium has a relative permittivity \(\epsilon_{r}=4\) and relative permeability \(\mu_{r}=1\). The speed of light in this medium is -
58. Which region of the electromagnetic spectrum is used to sterilize surgical instruments due to its ability to break molecular bonds?
59. Which concept was introduced by Maxwell to modify Ampere's law?
60. The ratio of the peak electric field \((E_{0})\) to the peak magnetic field \((B_{0})\) in a plane electromagnetic wave in free space is equal to -
61. In free space, if \(\vec{E}(z,t)=10^{3}\sin(\omega t-\beta z)\hat{a}_{y}\text{ V/m}\), then the value of \(\vec{H}(z,t)\) will be -
62. A plane electromagnetic wave of frequency 25 MHz travels in a free space along x-direction. At a particular point in space and time, \(\vec{E}=6.3\hat{j}\text{ V/m}\). What is value of \(\vec{B}\) at this point?
63. A TV tower has a height of 235 m. How much population is covered by the TV broadcast if the average population density around the tower is \(1000\text{ km}^{-2}\)?
64. The magnetic scalar potential exists, where -
65. Which of the following process is reversible?
66. Determine the efficiency of a reversible engine working between \(527^{\circ}C\) and \(27^{\circ}C\)
67. Which of the following fundamental evidence proves that electromagnetic waves are transverse and not longitudinal?
68. The electric field vector of a plane electromagnetic wave oscillates sinusoidally at a frequency of \(3\times 10^{10}\text{ Hz}\). What is its wavelength?
69. In ideal gas case, the work done in an isochoric process is given by the following -
70. A steam engine intakes 100 gm of steam at \(100^{\circ}\text{C}\) per minute and cools it down to \(20^{\circ}\text{C}\). Calculate the heat rejected per minute. (Latent heat = 540 cal/gm)
71. A heat engine operates between a cold reservoir at temperature \(T_{2}=300\text{ K}\) and a hot reservoir at temperature \(T_{1}\). It takes 200 J of heat from hot reservoir and delivers 120 J to cold reservoir. What could be the minimum temperature of hot reservoir?
72. An object which takes heat from a constant temperature source and rejects to a lower temperature body, is said to be -
73. The fundamental limitation to the coefficient of performance of a refrigerator is given by which of the following?
74. A fully charged car battery discharges losing 250 kcal to environment. Recharged consuming 0.53 kWh of electricity. What is heat transfer during charging?
75. A symmetric double convex lens is cut in two equal parts by a plane perpendicular to principal axis. If original power is 4 D, power of cut lenses will be -Cutting Symmetric Convex Lens Perpendicular to Principal Axis Power P = 4 D Cut P' = 2 D P' = 2 D
76. A near sighted man can clearly see objects upto a distance of 1.5 m. The power of the lens necessary for remedy will be -
77. A compound microscope has objective focal length 1 cm and eyepiece 2.5 cm. Object placed at 1.2 cm from objective for normal adjustment, angular magnification will be -
78. Which physical quantity is conserved in the first law of thermodynamics?
79. Which law of thermodynamics states that it is impossible to reach the absolute zero of temperature?
80. Two coherent sources of different intensities send waves which interfere. Ratio of maximum intensity to minimum intensity is 25:1. Intensities of sources are in which ratio?
81. Two sources are called coherent if they produce waves
82. A man wearing glasses of focal length +1 m cannot clearly see beyond 1 m,
83. The optical path of a monochromatic light is the same if it goes through 2.00 cm thick layer of glass or 2.25 cm thick layer of water. If refractive index of water is 1.33, what is refractive index of glass?
84. If the source of light used in a Young's double slit experiment is changed from red to violet then-
85. If a light wave travels in vacuum along the x-axis, then which of the following may represent the wave fronts?
86. A ray of light is incident on a liquid surface at polarizing angle \(i_{p}\), then angle between refracted ray and direction of electric field of reflected light is -Brewster's Law: Polarization by Reflection Liquid (μ) Air (μ = 1) Incident ray i_p Reflected ray (polarized) Refracted ray 90°
87. If the diameter of the objective lens of an astronomical telescope is increased, then its magnification
88. A diffraction grating is used to separate two wavelengths \(\lambda_{1}\) and \(\lambda_{2}\). When N slits are illuminated, resolving power R in mth order is -
89. A printed page is kept pressed by a glass cube \((\mu=1.5)\) of edge 6.0 cm. By what amount will printed letters appear to be shifted when viewed from top?
90. Light from a point source in air falls on a spherical glass surface \((\mu=1.5\), radius \(=20\text{ cm}\)). Distance of source is 100 cm. At what position image will be formed?
91. A double slit interference experiment uses laser emitted light of two adjacent frequencies \(v_{1}\) and \(v_{2}\) \((v_{1}
92. A lens with focal length 40 cm forms a Fraunhofer diffraction pattern of a slit 0.3 mm wide. If wavelength is 5890 Å, distance of first dark band from axis will be -
93. A man runs toward a plane mirror at \(5\text{ m/sec}\) and mirror on rollers approaches him at \(2\text{ m/sec}\). Speed of his image relative to ground is -
94. A microscope is focused on a mark. If a 2 cm thick glass slab \((\mu=1.5)\) is placed over mark, in order to refocus, microscope must be raised by vertical distance of
95. Light travels through glass \((\mu=1.5)\) of thickness t. What will be equivalent path length in air for this travel?
96. The average momentum of a molecule in a sample of an ideal gas depends on -
97. For a diatomic gas at room temperature, degree of freedom classically is -
98. Which of the following diagram(s) depicts ideal gas behaviour?Ideal Gas Behavior Diagrams (A) T V V ∝ T (P = const) (B) V P Linear P-V (Incorrect) (C) T P P ∝ T (V = const) (D) P PV Slanted PV vs P (Incorrect)
99. A convex lens of focal length f produces an image of an object of length l. If magnification is m and distance between object and screen is t, then correct relation is:
100. The rms speed of nitrogen at standard temperature and pressure will be (pressure = 1 atm, temp = \(0^{\circ}\text{C}\), density = \(1.25\text{ kg m}^{-3}\)).
101. The diameter of the molecule of a gas is \(2\times 10^{-10}\text{ m}\). The mean free path at NTP will be -
102. For a gas, the root mean square speed at 800 K will be -
103. Consider statements: 1. Mean free path decreases if molecular diameter increases. 2. Mean free path is independent of temperature at constant pressure.
104. Consider pairs of molecular speeds and formulas. How many are correctly matched?
105. Wave theory of light can explain which of the following phenomenon? I. reflection, photoelectric effect, Compton effect II. diffraction, interference, polarization III. photoelectric effect, reflection, diffraction
106. What is the de-Broglie wavelength associated with an electron moving with a speed of \(5.4\times 10^{6}\text{ m/sec}\)?
107. If \(\psi_{i}\) and \(\psi_{j}\) are two different wave functions, these wave functions will be normalised and orthogonal if
108. How does the mean free path of the molecules of a gas depend on the density of the gas?
109. What will be the ratio of specific heats \((\gamma = C_p / C_v)\) for monoatomic, diatomic and triatomic (linear) molecules of an ideal gas?
110. Which one of the following is not correct in context of the photon picture of electromagnetic radiation?
111. The density of state is proportional to \(E^{1/2}\), in which of the following case?
112. Which of the following pair of equations regarding the uncertainty principle are correct? I. \(\Delta x \cdot \Delta p \ge \frac{\hbar}{2}\) II. \(\Delta E \cdot \Delta t \ge \frac{\hbar}{2}\) III. \(\Delta E \cdot \Delta p \ge \frac{\hbar}{2}\) IV. \(\Delta E \cdot \Delta v \ge \frac{\hbar}{2}\)
113. What is the de-Broglie wavelength associated with an electron accelerated through a potential difference of 100 volts?
114. The quantity which cannot be conserved in photon-particle collision is -
115. Consider a particle of mass 'm' in a one-dimensional infinite potential well of width \(L=0.5\text{ nm}\). Calculate the number of allowed quantum states that have a wave vector 'k' in the range \(10\text{ nm}^{-1} \le k \le 100\text{ nm}^{-1}\).
116. An electron and proton are moving with the same kinetic energies. Which of the following statements is true about their de-Broglie wave?
117. If \(\psi_{1}(x)=A e^{-x^{2}/2}\) and \(\psi_{2}(x)=Be^{-x^{2}}\), the value of \(\langle \psi_{1} | \psi_{2} \rangle\) is -
118. Energy flux of sunlight reached on Earth surface is \(1\times 10^{3}\text{ W/m}^2\) at normal incidence. How many photons reach per square metre per second? (\(\lambda = 500\text{ nm}\))
119. How does the energy eigen values of a particle in a one-dimensional box depend on the length L of box?
120. Who estimated the size of nucleus first?
121. How much coal is required to generate energy that is equivalent to the energy generated through the fission of one kg (1 kg) of uranium?
122. Which of the following is the correct relativistic momentum-energy relation?
123. In which of the following, emission of electrons does not take place?
124. Heisenberg's uncertainty principle is applicable to -
125. Find the probability that the nucleus of \(_{87}\text{Ra}^{221}\) undergoes decay in over three half-life period, if it has a half-life of 6 days?
126. What type of reaction takes place in Sun?
127. If alpha, beta and gamma rays carry the same momentum, which has the longest wavelength?
128. Which one of the following is correct for Rydberg constant R?
129. An electron in a hydrogen atom performs a transition from \(n=4\) to \(n=2\) energy state. To which spectral series does this transition belong?Hydrogen Atom Spectral Series & Transitions n=1 (-13.6 eV) n=2 (-3.4 eV) n=3 (-1.51 eV) n=4 (-0.85 eV) n=5 (-0.54 eV) Lyman (UV) n=4 → n=2 (Hβ) Balmer Series (Visible) Paschen (IR)
130. An element 'X' has two isotopes, \(^{20}\text{X}\) with 90% abundance and \(^{22}\text{X}\) with 10% abundance. What is the average atomic mass?
131. As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly-ionised Lithium atom \((Z=3)\) is:
132. If the binding energy of a nucleus is greater than zero, then the nucleus :
133. Tritium has a half-life of 12.5 years, undergoing \(\beta\)-decay. What fraction of a sample of pure Tritium will remain undecayed after 25 years?
134. Consider spectral series of hydrogen: 1. Lyman 2. Balmer 3. Paschen 4. Bracket. How many of the above lie in the visible region?
135. The energy of an electron in a hydrogen atom in an excited state is -3.4 eV. Find the angular momentum of the electron.
136. The potential of a diatomic molecule is \(V(r)=-\frac{a}{r^{6}}+\frac{b}{r^{12}}\). Value of potential at equilibrium separation between atoms will be:
137. Electrical pumping is used in:
138. The ground state of \(_{11}^{23}\text{Na}\) is \(2s_{1/2}\). Difference of energy levels arising in presence of weak external magnetic field 'B' in terms of Bohr magneton \(\mu_{B}\) will be:
139. Which one of the following was a major drawback of Rutherford's atomic model?
140. If in a system, more atoms are in an excited state than its ground state, then this condition is termed as
141. What is Stark effect?
142. Which of the following method(s) is correct method(s) of achieving population inversion in case of laser?
143. In a normal Zeeman effect experiment, spectral splitting of lines at 656 nm corresponding to \(^{3}p_{2}-^{3}s_{1}\) transition is observed with resolution 0.008 nm. Minimum magnetic field required is:
144. Speed of an electron in Bohr's 5th orbit for hydrogen atom is \(3.6\times 10^{6}\text{ m/s}\). Corresponding speed in 9th orbit will be:
145. In a He-Ne Laser, the laser transition takes place in
146. The output of a laser \((\lambda=6600\text{ Å})\) has pulse duration of 35 ms, and average output power of 1 watt per pulse. How much energy per pulse is released?
147. What is the coherence length of a laser beam for which bandwidth is \(\Delta v=3000\text{ Hz}\)? \((c=3\times 10^{8}\text{ m/s})\)
148. The \(L_{\beta}\) lines of X-rays emitted from an atom arises from which transition?
149. For hard X-rays : (A) Wavelength higher (B) Intensity higher (C) Frequency higher (D) Photon energy higher
150. The coherence length \((L_{c})\) of a source is related to its spectral width \((\Delta \lambda)\) by: