🔬 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

When one mole of nitrogen combines with one mole of oxygen to yield nitrogen oxide, the temperature of the system falls below initial temperature. This is an example of:Answer: Exothermic reaction The covalent bond length between two atoms can be experimentally determined by:Answer: Electron diffraction The ionization energy of an atom depends upon the:Answer: Shielding effect of inner electrons Which of the following substances do NOT have a hexagonal structure:Answer: Gold Which of the following is a characteristic of plasma:Answer: lons are present The atomic weight of magnesium is twice that of carbon. if 1g of Magnesium contains x atoms, the number of atoms in 4g of carbon is:Answer: 2x A 500kg rocket travels in deep space of a constant speed of 300m/s. The power being produced by the rocket engine at this time:Answer: None of these A shell is fired at an angle of 45 degree above ground with an initial velocity of 100 m/sec. It will hit the ground assuming “g” 10 m/sec₂ after about:Answer: 14 seconds Find the average speed of a car whose velocity – time graph is shown in the figure:Answer: 15 m/sec A girl stands on a weighing scale placed in a stationary lift (elevator). The scale reads 30kg. The lift is then activated to move from ground floor to 10th floor. As the lift moves from its stationary position on the ground floor until it comes to rest on the 10th floor, the scale reading will:Answer: First increase, become constant for some time and then decrease A 1000 kg truck pulls a 500 kg car by means of a tope with a speed of 10 m/sec. The rope suddenly breaks causing the truck to move forward with a speed of 13 m/sec. Find the speed of the car after the rope breaks:Answer: 4 m/sec in the same direction as that of the truck In an elastic collision between two bodies, the following is conserved:Answer: Kinetic energy and momentum As the water falls from a top, its cross sectional are should decrease according to:Answer: Continuity equation The phenomenon if interference occurs in:Answer: All types of waves The density of oxygen is about 16 times that of the hydrogen. Therefore if speed of sound in oxygen is x, its speed in hydrogen will be:Answer: Greater than x A police motor cycle running at 130 km/h sounds a siren of 2 KHz frequency while a car running at 150 km/h. th apparent frequency of the siren heard by the car driver will be:Answer: Less than 2 KHz Young’s double slit experiment is used to study interference of:Answer: Visible light The following device does not use electromagnetic waves for its operation:Answer: Ultra-sound machine When a metal surface is escaped to light it may emit electrons. The maximum energy of these electrons depends on:Answer: Wavelength of light According to Heisenberg’s uncertainly principle, for any given particle it is not possible to accurately measure :Answer: Both position and momentum Two blocks of iron are heated to 200 degree C and 400 degree C respectively. Compared to the 200 degree C blocks, the 400 degree C block will emit radiation of:Answer: Smaller wavelength More than one crystalline form of an element:Answer: Allotropy The smallest part of a crystal lattice is:Answer: A unit cell A crystal system in which all axis are equal, but non of the angel is 90 degree is:Answer: Rhombohedral Fast neutron has an energy of:Answer: 1 Mev Which of the electronic configuration of nitrogen is correct?Answer: 1s₂ ,2s₂ ,2p₄ Which of the electronic configuration represents an element that forms a simple ion with charge of 3?Answer: 1s₂ ,2s₂ ,2p₂ ,3s₂ ,3p₁ To ensure that ethanol is not used for drinking purposes, it is converted to methylated spirit by adding:Answer: 10% methanol and a little acetone Pickle (achar in urdu) when placed in the path of current:Answer: Will conduct current Acetaldehyde can be prepared by oxidizing:Answer: Ethyl alcohol