MCQOPTIONS
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MCQOPTIONS
This section includes 1292 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge knowledge and support exam preparation. Choose a topic below to get started.
| 801. |
Air is said to be saturated when |
| A. | its pressure is minimum |
| B. | it contains the maximum content of water vapour |
| C. | its thickness is maximum |
| D. | it blows over the barren land |
| Answer» C. its thickness is maximum | |
| 802. |
Air expands when it _______________. |
| A. | is cooled |
| B. | is heated |
| C. | is under pressure |
| D. | becomes more humid |
| Answer» C. is under pressure | |
| 803. |
Addition of suitable impurities into semiconductor, is called |
| A. | Doping |
| B. | Mixing |
| C. | Forming |
| D. | Diluting |
| Answer» B. Mixing | |
| 804. |
According to ohm's law, which of the following is true?_x005F_x000D_ |
| A. | The current flowing through a wire is directly proportional to the Potential Difference applied across its ends |
| B. | The current flowing through a wire is directly proportional to its resistance |
| C. | The current flowing through a wire is indirectly proportional to its length |
| D. | The current flowing through the wire is indirectly proportional to the Potential Difference applied across its ends_x005F_x000D_ |
| Answer» B. The current flowing through a wire is directly proportional to its resistance | |
| 805. |
According to Rutherford the radius of the nucleus is about ______ than the radius of the atom._x005F_x000D_ |
| A. | 105 times greater |
| B. | 105 times lesser |
| C. | 109 times greater |
| D. | 107 times greater |
| Answer» C. 109 times greater | |
| 806. |
Acceptable noise level for human ear |
| A. | > 85 db |
| B. | 0 |
| C. | < 85 db |
| D. | None of the above |
| Answer» D. None of the above | |
| 807. |
According to Ohm's law, if current (I) increase and potential difference (V) remains constant, then |
| A. | resistance unchanged |
| B. | resistance decreases |
| C. | potential difference decreases |
| D. | resistance increases |
| Answer» C. potential difference decreases | |
| 808. |
According to the Second Law of Motion, for a given force, acceleration is inversely proportional to the ____ of an object. |
| A. | density |
| B. | volume |
| C. | force |
| D. | mass |
| Answer» E. | |
| 809. |
Acceleration is |
| A. | Inversely proportional to force |
| B. | Inversely proportional to mass |
| C. | Directly proportional to mass |
| D. | Directly proportional to force |
| Answer» E. | |
| 810. |
Acceleration due to gravity on a planet decreases with ______. |
| A. | decrease in radius of the planet |
| B. | increase in mass of the planet |
| C. | decrease in mass of the body |
| D. | increase in altitude from surface of the planet |
| Answer» E. | |
| 811. |
Acceleration is the rate of change of |
| A. | Speed |
| B. | Velocity |
| C. | Jerk |
| D. | Jounce |
| Answer» C. Jerk | |
| 812. |
AC is converted into DC by a |
| A. | Condenser |
| B. | Rectifier |
| C. | Amplifier |
| D. | Filter |
| Answer» C. Amplifier | |
| 813. |
A woman’s voice is shriller than a man’s voice due to |
| A. | weak vocal chords |
| B. | lower frequency |
| C. | higher frequency |
| D. | higher amplitude |
| Answer» D. higher amplitude | |
| 814. |
A wave with high amplitude have |
| A. | high pitch |
| B. | low energy |
| C. | high energy |
| D. | low pitch |
| Answer» D. low pitch | |
| 815. |
A wooden block of mass m1 kg accelerates at m/s when a force of 5 N acts on it. Another block of mass m2 kg accelerates at 20 m/s when the same force acts on it. If both the blocks are tied together and the same force acts on their combination, the acceleration will be about_x005F_x000D_ |
| A. | 6.67Â m/s2 |
| B. | 1.67Â m/s2 |
| C. | 5.67Â m/s2 |
| D. | 4.67Â m/s2 |
| Answer» B. 1.67Â m/s2 | |
| 816. |
A wire of copper having length I and area of cross-section A is taken and a current / is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be |
| A. | P |
| B. | < P |
| C. | > P |
| D. | 2P |
| Answer» D. 2P | |
| 817. |
A voltaic cell converts chemical energy to |
| A. | Heat energy |
| B. | Electrical energy |
| C. | Mechanical energy |
| D. | Light energy |
| Answer» C. Mechanical energy | |
| 818. |
A unit of power is called a |
| A. | Joule |
| B. | Pascal |
| C. | Newton |
| D. | Watt |
| Answer» C. Newton | |
| 819. |
A transformer can do all of the following except |
| A. | stepÂ-up a/c voltage |
| B. | stepÂ-up a/c current |
| C. | stepÂ-up a/c power |
| D. | stepÂ-down a/c voltage |
| Answer» D. stepÂ-down a/c voltage | |
| 820. |
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank? |
| A. | The liquid surface falls down on the direction of motion and rises up on the back side of the tank |
| B. | The liquid surface falls down only at the center of the tank |
| C. | The surface of the liquid remains horizontal |
| D. | None |
| Answer» B. The liquid surface falls down only at the center of the tank | |
| 821. |
A tennis ball machine serves a ball vertically into the air from a height of 2 feet, with an initial speed of 110 feet per second. After how many seconds does the ball attain its maximum height? |
| A. | 2.87 sec |
| B. | 3.44 sec |
| C. | 4.65 sec |
| D. | 5.41 sec |
| Answer» C. 4.65 sec | |
| 822. |
A student lifts a heavy book from the floor of a room to put it in the bookshelf at a height 2 m For this process, the student takes 5 s. The work done by the student will depend upon:_x005F_x000D_ |
| A. | the height of the book shelf and the time taken |
| B. | the mass of the book, the height of the book shelf and the time taken |
| C. | the mass of the book and the time taken |
| D. | the weight of the book and the height of the bookshelf |
| Answer» E. | |
| 823. |
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because |
| A. | the floor and carpet are at different temperatures |
| B. | the stone conveys the heat away from the feet more rapidly than the carpet |
| C. | the carpet is a better conductor of heat than the stone |
| D. | the human body maintains a constant temperature |
| Answer» C. the carpet is a better conductor of heat than the stone | |
| 824. |
A spring is an example of which of these |
| A. | Newton's 3rd law |
| B. | Hooke's law |
| C. | Newton's 1st law |
| D. | Conservation of mass law |
| Answer» C. Newton's 1st law | |
| 825. |
A standing wave occurs when |
| A. | a wave reflects upon itself |
| B. | the amplitude of a wave exceeds its wavelength |
| C. | two waves overlap |
| D. | the speed of the wave is zero or near zero |
| Answer» B. the amplitude of a wave exceeds its wavelength | |
| 826. |
A spoon which looks bent is an example of which of the following? |
| A. | Reflection |
| B. | Refraction |
| C. | Retention |
| D. | Focus |
| Answer» C. Retention | |
| 827. |
A sound wave has a frequency of 4 kHz and a wavelength of 40 cm. The time taken by the sound wave to travel a distance of 3.2 km is |
| A. | 0.5 s |
| B. | 2.0 s |
| C. | 4.0 s |
| D. | 1.0 s |
| Answer» C. 4.0 s | |
| 828. |
A source maintains a current I in a resistor of resistor of resistance R. If V is the potential difference across the resistor. The electrical energy dissipated in the resistor in time is given ______x005F_x000D_ |
| A. | VI2t |
| B. | V2It |
| C. | IR2t |
| D. | VIt |
| Answer» E. | |
| 829. |
A Sonar of a ship sends sounds waves of speed 1500 m/s. These waves are reflected back by the ocean floor in 5 seconds. Find the depth (in m) of the ocean floor. |
| A. | 3750 |
| B. | 7500 |
| C. | 1875 |
| D. | 5000 |
| Answer» B. 7500 | |
| 830. |
A Sonar of a ship sends sounds waves of speed 1600 m/s. These waves are reflected back by the ocean floor in 4 seconds. Find the depth (in m) of the ocean floor._x005F_x000D_ |
| A. | 6400 |
| B. | 3200 |
| C. | 1600 |
| D. | 4800 |
| Answer» C. 1600 | |
| 831. |
A sound of single frequency is called a |
| A. | Hertz |
| B. | Tone |
| C. | Pitch |
| D. | Note |
| Answer» C. Pitch | |
| 832. |
A Sonar of a ship sends sounds waves of speed 1000 m/s. These waves are reflected back by the ocean floor in 2 seconds. Find the depth (in m) of theocean floor. |
| A. | 2000 |
| B. | 500 |
| C. | 1000 |
| D. | 100 |
| Answer» D. 100 | |
| 833. |
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will |
| A. | increase |
| B. | decrease |
| C. | remain unaffected |
| D. | have its shape changed |
| Answer» B. decrease | |
| 834. |
A series of fast moving still pictures can be made to appear as a moving picture because the eye |
| A. | can focus very rapidly as pictures change |
| B. | is quicker than the brain |
| C. | can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second |
| D. | can shut out some of the light |
| Answer» D. can shut out some of the light | |
| 835. |
A second wave has a frequency of 3.5 kHz and wavelength 0.1 m. How long will it take to travel 700 m? |
| A. | 3.0 s |
| B. | 1.5 s |
| C. | 2.0 s |
| D. | 1 s |
| Answer» D. 1 s | |
| 836. |
A solar eclipse occurs when |
| A. | moon comes in the middle of sun and earth |
| B. | sun comes in the middle of moon and earth |
| C. | earth comes in the middle of moon and sun |
| D. | All of the above |
| Answer» B. sun comes in the middle of moon and earth | |
| 837. |
A raised hammer possesses |
| A. | Kinetic energy |
| B. | Mechanical energy |
| C. | Muscular energy |
| D. | Potential energy |
| Answer» E. | |
| 838. |
A rocket is launched to travel vertically upward with a constant velocity of 20 m/s. After travelling for 35 seconds, the rocket develops a snag and its fuel supply is cut off. The rocket then travels like a free body. The height achieved by it is |
| A. | 680 m |
| B. | 720 m |
| C. | 800 m |
| D. | 700 m |
| Answer» C. 800 m | |
| 839. |
A plane mirror produces a magnification of_x005F_x000D_ Â _x005F_x000D_ |
| A. | 0 |
| B. | 1 |
| C. | Infinity |
| D. | -1 |
| Answer» C. Infinity | |
| 840. |
A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is : |
| A. | 0.12777777777778 |
| B. | 0.21111111111111 |
| C. | 0.20902777777778 |
| D. | 0.12638888888889 |
| Answer» E. | |
| 841. |
A person does some work of 1,000 J in 2 s. His power will be ...... |
| A. | 1000W |
| B. | 25W |
| C. | 500W |
| D. | 50W |
| Answer» D. 50W | |
| 842. |
A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will |
| A. | first rise and then fall |
| B. | fall |
| C. | remain the same |
| D. | rise |
| Answer» D. rise | |
| 843. |
A person lifts luggage of 20 kg from the ground and puts it on his head 2 in above the ground. Calculate the work done by him. (g = l0 ) |
| A. | 20 J |
| B. | 400J |
| C. | 200J |
| D. | 40J |
| Answer» C. 200J | |
| 844. |
A person is sitting in a moving train and is facing the engine. He tosses up a coin and the cion fals behind him. It can be concluded that the train is moving: |
| A. | forward and loosing speed |
| B. | forward and gaining speed |
| C. | forward and uniform speed |
| D. | backward with uniform speed |
| Answer» C. forward and uniform speed | |
| 845. |
A person holding a pen in his left hand sees his reflection in the mirror holding the pen in his right hand. This is due to which of the following phenomena? |
| A. | Diffused reflection |
| B. | Total internal reflection |
| C. | Lateral inversion |
| D. | Refraction |
| Answer» D. Refraction | |
| 846. |
A particle is thrown vertically upward. When it reaches the highest point, it has ____________ |
| A. | a downward acceleration |
| B. | an upward acceleration |
| C. | a downward velocity |
| D. | a horizontal velocity |
| Answer» B. an upward acceleration | |
| 847. |
A parallel-plate capacitor of capacitance C1is made using two gold plates. Another parallel-plate capacitor of capacitance C2is made using two aluminium plates with same plate separation, and all the four plates are of same area. If gï²and aPare respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct? |
| A. | C1>C2 |
| B. | C2>C1 |
| C. | C1pa = C2pg |
| D. | C1 = C2 |
| Answer» E. | |
| 848. |
A periscope works by the principle of |
| A. | Total internal reflection |
| B. | Refraction |
| C. | Diffraction |
| D. | Reflection & Refraction |
| Answer» B. Refraction | |
| 849. |
A particle experiences constant acceleration for 20 s after starting from rest. If it travels a distance X1, in the first 10 s and distance X2 in the remaining 10 s, then which of the following is true?_x005F_x000D_ |
| A. | X2 = 2X1 |
| B. | X1 = 3X2 |
| C. | X2 = X1 |
| D. | X2 = 3X1 |
| Answer» E. | |
| 850. |
A permanent magnet can affect |
| A. | Magnets |
| B. | Electromagnets |
| C. | Both A & B |
| D. | None of the above |
| Answer» D. None of the above | |