🔬 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

Death:Answer: All of these Why is stressed that humans can understand and utilize the principle of naturalphenomenon in a restricted domain?Answer: Because humans can make machines Scientist cannot make energy themselves. This point is elaborated in the paragraph by explaining:Answer: They cannot make natural resources themselves The distances of heavenly objects in space have been termed as mind boggling:Answer: Because of their sheer magnitude which baffles our imagination A heart that beats for so many years minimum input and without maintenance is a proof that:Answer: It is a low power machine If a natural energy resources becomes unavailable, scientist, engineers, and technologists:Answer: Look for alternate resource to compensate the loss Scientists, engineers and technologists cannot make a machine that:Answer: Is like a fly which grows, reproduces and has features similar to it. Density of oxygen is about 16 times that of hydrogen. Therefore if speed of hydrogen is x, then speed of oxygen?Answer: Less than x When you drop a ball it accelerates at 9.8m/sec₂. If you instead throw it downward then it accelerates immediately after leaving your hand assuming no air resistance:Answer: 9.8 In an inelastic collision between two bodies, following is conserved?Answer: Momentum A Police motor cycle running at 140 km/hr sounds a siren of 2 Hz frequency while shasing a car at 150 Km/hr. The apparent frequency heard by the car driver is:Answer: Greater than 2 Hz Consider two spheres A and B of radii ra and rb both concentric with point charge Q. if ra>rb then the total flux passing normally through the sphere A and B is related as?Answer: Flux through both spheres is equal In an inelastic collision between two bodies, the following is conserved:Answer: Momentum only When a metal surface is exposed in light, in may emit electron. The maximum energy of these electrons depends on:Answer: Wavelength of light According to Heisenberg’s uncertainty principle, for any given particle is not possible to accurately measure:Answer: Both position and momentum What is the empirical formula of glucose:Answer: CH₂O Base principle of crystallization is:Answer: Solute should be soluble in a suitable amount of solvent at high temperature and excess amount of solute is thrown out as crystals when it is cooled The bubbling up of gas from soda drink is best explained by:Answer: Decreased pressure of the surroundings cause the gas to come out from high pressure liquid The effect of pressure on density of gas is explained as under:Answer: Increase in pressure causes increase in density Forces which make the liquefaction of Helium gas possible are:Answer: London dispersion forces Existence of sulphur in two forms is:Answer: Allotropy The boiling point of hydrofluoric acid (HF) as compared to water (H₂O) is due to:Answer: Formation of one hydrogen bond by F atom per HF molecule as compared to two hydrogen bonds by O atom per H₂O molecule Radiations emitted in the form of Photons when electrons of Hydrogen atom full from higher level to n = 1 level are in the:Answer: Ultra-violet region The structure of nitrogen molecule (N₂) is explained by:Answer: End to end overlap of orbitals form sigma (σ) bond and sideways overlap of other orbitals form two pi (π) bonds The solubility of sodium chloride in water is possible because:Answer: Hydration energy of water is greater than lattice energy According to first law of thermodynamics, if thermal energy is applied to water placed in a cylinder fitted with a frictionless piston:Answer: All of these NaCl is not soluble in acetone because:Answer: Acetone molecules cannot overcome the inter-ionic forces of NaCl Ethylene glycol is mixed with water in automobile radiators as antifreeze because:Answer: All of these The purpose of two half cells in a galvanic cell is:Answer: Chemical reaction between the solutions of two half cells does not take place Catalyst helps in a reaction by:Answer: Both Options A and B are correct