🔬 General Science Solved MCQs with Answers

Practice 4010 approved 🔬 General Science questions with verified answers from the 🌐 Current Affairs & GK subject for Pakistan exams.

4010 solved MCQs

What is pH of a 1 molar solution of an acid that has a Ka - 10.8?Answer: None of these Water containing calcium and phosphate is called _____?Answer: Temporary hard water Which of the following halides will react most rapidly in a SN2 reaction?Answer: CH₃I Phenols are ______?Answer: Acidic in nature The molecule N2 is isoelectronic with ______?Answer: CN⁻ A man who weighs 60 kg on earth, weighs 61 kg on a rocket as measured by an observer on the earth. What is the speed of the rocket?Answer: 5.5 × 10^7 m/s The identify of an element is determined by ______?Answer: The number of its proton The value of molar specific heat according to classical theory is _____?Answer: 3R Which of the following electron configuration represents the electron configuration for a magnesium cation ... Mg^2+?Answer: 1s^2 2s^2 2p^6 Bragg's equation is a consequence of _____?Answer: Laue equations When the following reaction is properly balanced, the number of moles of O₂ will be _____? C₆H₁₄ + O₂ → CO₂ + H₂O”Answer: 19 moles If the absolute temperature of a gas is doubled and the pressure of the gas is halved, how will the volume charge?Answer: It will increase by four times its original value A torque of 2 x 10^-4 Nm is applied to produce an angular acceleration of 4rad/s^2 in a rotating body. What is the moment of inertia of the body?Answer: 0.5 × 10^-4 kgm^2 Quantum Numbers are solution of _____?Answer: Schrodinger's Wave Equation Which of the following transitions is the highest energy transition?Answer: σ to σ∗ The major reason that phenol is a better Bronsted acid than cyclohexanol is _____?Answer: Phenol is able to stabilize the anion formed in the reaction by resonance Uranium-238 forms Thorium-234 after radioactive decay and has a half-life of 4.5 × 10^9 years. How many years will it take to decay 75% of the initial amount?Answer: 9 × 10⁹ years A position dependent force, F= 7-2x 3x^2 N acts on a small body of mass 2kg and displaces it from x = 0 to x = 5m. The work done in joules is?Answer: 135 Why is oxygen-hydrogen absorption of CH₃OH such a broad band in the infrared?Answer: Hydrogen bonding broadens the absorption Magnetic vector potential is a vector _____?Answer: Whose curl is equal to the magnetic flux density Which of the following compounds would have the highest boiling point? CH₃OH, CH₃NH₂, CH₃CH₂CH₂CH₂,None of theseAnswer: CH₃OH The distance between the adjacent atomic planes in CaCO3 is 0.3nm. The smallest Bragg scattering for 0.03nm X-ray is?Answer: 2.9° The latent heat of vaporization of water is 2,240 J. If the work done in the process of vaporization 1g is 168 J, then the increase in internal energy is?Answer: 2072 J Calculate the moment of inertia of the earth about its diameter, taking it to be a sphere of 10^25kg and diameter 12800 km?Answer: 1.64 × 10^38kgm^3 While launching a rocket of mass 2×10^4 kg, a force of 5×10^5 N is applied for 20s. Calculate the velocity attained by the rocket at the end of 20s?Answer: 500m/s x → Ni 6528 + y. Identify the missing nuclide in gamma decay.Answer: Ni6528 The linear density of a vibrating string is 1.3 x 10^-4 kg/m3. A transverse wave is propagating on the string and is described by the equation Y = 0.021 sin (x + 30t) where x and y are measured in meters and t in seconds. The tension in the wire?Answer: 0.12 N The average translational K.E. of the molecules in a sample of oxygen at 300K is 6 x 10-20. What is the average translational energy at 750 K?Answer: 1.5 x 10^-19 J The mean free path of nitrogen molecules at 27°C is 3 x 10^-7 m/s. If the average speed of nitrogen molecules at the same temperature is 600 m/s then the collision frequency will be?Answer: 2 x 10^-9/sec A disc of mass 2 kg and diameter 2m is performing rotational motion. Find the work done, if the disc is rotating from 300 rpm to 600 rpm?Answer: 1479 J