Physics one-liners for various competitive examinations-July 4th, 2019

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1- The shape of a liquid drop is determined by- when there are no external forces.

(a) The temperature of air only

(b) Viscosity of liquid

(c) Density of liquid

(d) The surface tension of the liquid

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2- Let us assume the surface of a liquid is plane, then the angle of contact of the liquid with the walls of the container is

(a) Obtuse angle

(b) Acute angle

(c) 0°

(d) 90°

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3- If the angle of contact between a solid and a liquid is 90°, then

(a) Cohesive force < Adhesive force

(b) Cohesive force > Adhesive force

(c) Cohesive force >> Adhesive force

(d) Cohesive force = Adhesive force

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4- This is not based on the principle of capillarity.

(a) Rise of oil in the wick of the lantern

(b) Soaking of ink by bloating paper

(c) Floating of wood on the water surface

(d) Plowing of soil

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5- This is due to – factor, Raindrops are spherical in shape.

(a) Acceleration due to gravity

(b) Downward motion

(c) Capillary

(d) Surface tension

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6- Due to which process, the Plants get water through the roots?

(a) Elasticity

(b) Gravity

(c) Viscosity

(d) Capillarity

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7- If common salt is dissolved in water, then the Surface Tension of salt water is

(a) Decreased

(b) Increased

(c) First decreases and then increases

(d) Not Changed

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8- In a fine capillary tube, the height of a liquid

(a) Increases as the effective value of acceleration due to gravity is decreased

(b) Decreases with an increase in the surface tension

(c) Decreases with a decrease in the diameter of the tube

(d) Increases with an increase in the density of a liquid

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9- Define Surface tension.

(a) Free surface energy per unit volume

(b) The work done per unit area in increasing the surface is of a liquid under both isothermal and adiabatic conditions.

(c) The work done per unit area in increasing the surface area of a liquid under adiabatic condition

(d) The work done per unit area in increasing the surface area of a liquid under isothermal condition

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10-The surface of the water in contact with glass wall is

(a) convex

(b) Plane

(c) concave

(d) Both b and c

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11- What will be the reaction when a soap bubble is charged

(a) It does not undergo any change in size

(b) It contracts

(c) It expands

(d) None of these

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12- Meniscus of mercury in the capillary is-

(a) Convex

(b) Concave

(c) Cylindrical

(d) Plane

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13- Why Kerosene in the wick of lantern rises up?- Because of

(a) Of the surface tension of the oil

(b) Wick attracts the kerosene

(c) Of negligible viscosity

(d) The diffusion of the oil through the wick

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14- The surface tension at the boiling point of water is-

(a) Is zero

(b) Is infinite

(c) Is maximum

(d) Is the same as that at room temperature

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15- Excess pressure inside a soap bubble is-

(a) Directly proportional to square roots of its radius

(b) Independent of its radius

(c) Inversely proportional to its radius

(d) Directly proportional to its radius

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ANSWERS-

1- Surface tension of the liquid

2- 0°

3- Cohesive force = Adhesive force

4- Floating of wood on the water surface

5-Surface tension

6-Capillarity

7- Increased

8- Increases as the effective value of acceleration due to gravity is decreased

9-The work done per unit area in increasing the surface area of a liquid under isothermal condition

10- concave

11- It expands

12- Convex

13- Of the surface tension of the oil

14- Is zero

15- Inversely proportional to its radius

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Physics one-liners for various competitive examinations- May 13

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1- When a body is raised upwards from the Surface of the earth, the impact of its weight shall

(A) increase
(B) fluctuate
(C) decrease
(D) remain the same.

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2- The kinetic energy in simple harmonic motion

(A) Is never zero
(B) Becomes zero twice in every period
(C) Is zero in the mean position
(D) Is always constant

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3- Which among the following is an example of a scalar quantity

(A) Force
(B) Velocity
(C) Energy
(D)Momentum.

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4- The number of images formed will be – when an object is placed between two parallel mirrors.

(A) Two
(B) Eight
(C) Infinite
(D) Thirty-Two.

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5- Due to this effect, a piece of cotton cloth gets wet if one end of it is dipped in water in a glass.

(A) Gravitation
(B) Viscosity
(C) Elasticity
(D) Capillarity.

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6- Why a balloon filled with hydrogen bursts on reaching high altitude? Because-

(A) The pressure inside the balloon becomes less
(B) The pressure inside the balloon becomes more
(C) The surface of the balloon gets melted
(D) It is a natural phenomenon

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7- The minimum distance between an object and its real image in a convex lens is

(A) Equal to 4f
(B) More than 4f
(C) Equal to 2f
(D) Less than 4f.

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8- Why the ink of pen leaks in an airplane?- Because

(A) The pressure of ink inside is more than the outside pressure.
(B) Atmospheric pressure increases
(C) Temperature difference
(D) High speed of the airplane.

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9- On what principle, the Hydrogen Bomb is based on?

(A) Nuclear fission
(B) Nuclear explosion
(C) Nuclear fusion
(D) None of the above.

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10- On what factors below, the emf of a cell does not depend on?

(A) Electrolyte used
(B) The material of the anode
(C) The material of the cathode
(D) The size of the cell

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11- The ship entering the sea from a river floats up because

(A) Seawater is warmer
(B) The density of the river water is greater
(C) Saltwater of the sea is denser
(D) The speed of the ship on the sea is greater.

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12- The hydraulic breaks is a direct application of –

(A) Archimedes
(B) Pascal’s law
(C) Torricelli law
(D) Bernoulli’s theorem

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13- What type of work is performed by hand when a body is lifted by hand?

(A) Simple machine
(B) The third type of lever
(C) The second type of lever
(D) The first type of lever

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14- Joule-Thomson effect in case of an ideal gas is

(A) infinite
(B) negative
(C) positive
(D) zero

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15- Which among the following is the only vector quantity?

(A) Electric charges
(B) Electric potential
(C) Electric field intensity
(D) Electric resistance

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ANSWERS-

1- decrease.

2- Becomes zero twice in every period.

3- Energy.

4- Infinite.

5- Capillarity.

6-The pressure inside the balloon becomes more.

7- Equal to 2f.

8-The pressure of ink inside is more than the outside pressure.

9-Nuclear fusion.

10- The size of the cell.

11-Saltwater of the sea is denser

12-Pascal’s law.

13- Third type of lever.

14- zero.

15-Electric field intensity.

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Physics one-liners for various competitive examinations- Jan 26

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1-A jet engine works on the principle of conservation of

1-Angular momentum

2-Mass Velocity.

3- Energy Mass.

4- Linear momentum.

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2- The electric motor converts

1- Electrical energy into light energy.

2- Electrical energy into mechanical energy.

3- Mechanical energy into electrical energy.

4- None of these.

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3- Name the law which is also called the law of inertia.

1- Newton’s Second Law.

2- Newton’s Third Law.

3- Newton’s first law.

4- All of these.

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4- With the increase in pressure, the result of the boiling point of any substance

1- Becomes zero.

2- Decreases.

3- Remains Same.

4- Increases.

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5- The Product of Force and Velocity is called as-

1- Momentum.

2- Work.

3- Power.

4- Energy.

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6- The unit of Astronomical Distance is

1- Lux.

2- Angstrom.

3- Light year.

4- Weber.

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7- Young’s modulus is the property of-

1- Both Solid and Liquid.

2- Liquid only.

3- Solid only.

4- Gas only.

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8- This quantity remains constant when an artificial Satellite revolves around the Earth in a circular orbit.

1-Linear Velocity.

2- Angular Displacement.

3- Angular Momentum.

4- None of these.

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9- In which temperature the density of water is maximum?

1- 0-degree Centigrade.

2- 4-degree Centigrade.

3- 100-degree Centigrade.

4- 273-degree Centigrade.

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10- Name the method that can be applied to determine the purity of the metal.

1- Archimedes principle.

2- Pascal’s law.

3- Newton’s law.

4- Boyle’s law.

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11- The loudness of a sound depends upon ________ of the sound wave.

1- Wavelength.

2- Pitch.

3- Frequency

4- Amplitude.

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12- Name the instrument that is used to study the laws of vibrating string.

1- Hygrometer.

2- Hydrometer.

3-Electrometer.

4- Sonometer.

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13- Name the device that is used to measure the wavelength of X-rays.

1- Manometer.

2- Spectrometer.

3- SWR meter.

4- Framing square.

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14- Name the instrument that is used to measure atmospheric humidity.

1- Tachometer.

2- Tintometer.

3- Thermometer.

4- Hygrometer.

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15- This device is used to measure the intensity of light-

1- Inkometer.

2- Lux meter.

3- Heliometer.

4- Load cell.

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ANS-

1- Linear momentum.

2-Electrical energy into mechanical energy.

3-Newton’s first law.

4-Increases.

5-Power.

6-Light year.

7-Solid only.

8-Angular Momentum.

9-4 degree Centigrade.

10-Archimedes principle.

11- Amplitude.

12-Sonometer.

13-Spectrometer.

14-Hygrometer.

15- Lux meter.

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Physics one-liners for various competitive examinations

Welcome to the Physics Section page.

We know the importance of general awareness, GK (General Knowledge) in various competitive exams for aspirants.

We are publishing general awareness notes and study material on various subjects daily.

These Physics notes are extremely useful for all exams including Bank Exams.

Watch One-Liners 

---

1- The time required for a current to be established in a circuit depends upon –

1-Inductance.
2- Its inductance and resistance.
3-Magnitude of the current.
4- The applied potential difference.

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2- The electromotive force is most closely related to-

1- Inductance.
2-Electric field intensity.
3- Potential difference.
4- Magnetic flux density.

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3-Ammonium Cyanate on heating gives-

1- Methyl-Amine.
2- Urea.
3- Methyl Ameno Ketone.
4- Nitro Cyanide and Ammonia.

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4- Magnetic quantum value for the 24th electron is –

1- 1
2- – 1.
3- -2.
4- 0

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5- Metal detectors kept in security zones work on the principle of-

1- Oersted.
2- Ampere Rule.
3- Fleming’s Right hand rule.
4- Electromagnetic Induction.

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6-Concentration of ore does not include-

1- Froth Flotation.
2- Washing.
3- Magnetic Separation.
4- Distillation.

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7- Number of hydrogen atoms present in cyclopentane are –

1- 8.
2- 14
3- 10
4- 12

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8- The element which does not exhibit catenation is –

1- Sulphur.
2- Phosphorous.
3- Carbon.
4- Copper.

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9- The image formed due to a plane mirror will not obey-

1- The objective distance is always equal to the image distance.
2- The image undergoes lateral inversion.
3- The size of the image is proportional to the size of the mirror.
4- The size of the image is always equal to the size of the object.

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10- Refractive Index gives an idea of –

1-The density of the transparent medium.
2-How hard or how soft the material medium is.
3- How fast or how slow the light travels in that medium.
4- The physical state of the material medium.

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ANS-

1- Its inductance and resistance.
2- Potential difference.
3-Urea.
4- 1
5-Electromagnetic Induction.
6-Distillation.

7-10
8-Copper.
9-The size of the image is proportional to the size of the mirror.
10-How fast or how slow the light travels in that medium.

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Physics one-liners for various competitive examinations

Welcome to the Physics Section page.

We know the importance of general awareness, GK (General Knowledge) in various competitive exams for aspirants.

We are publishing general awareness notes and study material on various subjects daily.

These Physics notes are extremely useful for all exams including Bank Exams.

Watch One-Liners 

---

1-The absorption of ink by blotting paper involves___?

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2-Why are Metals good conductor of heat than insulator?

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3-Most commercial nuclear power plants worldwide are cooled by __?

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4-Weightlessness experienced in a spaceship is due to___?

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5- Which instrument is used to measure the change in volume of substances?

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6- The Potential energy of your body is minimum when you _______.

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7-On which principle, transformer works?

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8-The velocity of sound in air___?

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9-What is the unit of magnetic flux?

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10-Acceleration acts always in the direction__?

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11-Which is used to initiate fissions ?

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12-Radio waves of constant amplitude can be generated with___?

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13-Nature of the sound wave is ____?

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14-We cannot see during a fog, because of ____.

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15-What is the SI unit of luminous intensity?

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16-When a red glass is heated in dark room it will seem___.

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17-The friction force exerted by fluids is called ___.

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18-The sky appears black from the moon because of __?

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19-In the visible spectrum which color has the shortest wavelength?

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20-The hydraulic brake used in automobiles is a direct application of__?

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21-What do we use as a moderator in the nuclear reactor?

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22- A simple device that is used to either break or completes the electric circuit, is called _____?

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ANS-

1- Capillary Action
2-They contain free electrons
3- Water
4-Absence of Gravity
5-Dilatometer
6-Lie down on ground
7-Mutual Induction
8-332m/sec
9- Maxwell
10- of the net force
11-Neutrons
12-Oscillator
13-Longitudinal
14-Scattering of light
15-Candela
16-Green
17-Drag
18-Lack of Atmosphere
19-Violet
20-Pascal’s Law
21-Graphite
22-Switch

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Physics one-liners for various competitive examinations

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---

1- When milk is churned the cream separates from it due to

(a)Centrifugal force
(b)Frictional force
(c)Gravitational force
(d)Viscous forces

2- Light beam which is highly directional is called-

(a)eraser
(b)laser
(c)maser
(d)grazer

3-Conversion of heat into electrical is achieved by using
(a)Ammeter
(b)Voltmeter
(c)Hydrometer
(d)Thermocouple

4-A man cannot see clearly beyond 10 meters. The disease
he suffers from
(a)Myopia
(b)Farsight
(c)Cataract
(d) Hypermetropia

5-Ball pen functions on the principle of

(a)Gravitational force
(b)Boyles Law
(c)Viscosity
(d)surface tension

6-The S.I. Unit of electric charge is
(a) ampere
(b)e.s.u
(c)coulomb
(d)Kelvin

7-A periscope works on the principle of
(a)reflection
(b)total internal reflection
(c)diffraction
(d)refraction

8-A rearview mirror for driving is
(a)plain
(b) inverted
(c) convex
(d) concave

9-The layer of atmosphere used for radio wave
transmission is
(a)stratosphere
(b)troposphere
(c)chromospheres
(d)ionosphere

10-Water cannot be used to extinguish fire caused by electric current because
(a) it may cause electrolysis
(b)it may cause hydrolysis
(c)it may cause electrocution
(d)it may spoil the wiring

11-The device used for locating submerged objects under
sea is
(a)maser
(b)radar
(c)laser
(d)sonar

12-A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is
(a)one
(b) zero
(c)less than one
(d)more than one

13-The surface tension of water on adding detergent to it
(a)decreases
(b)increases
(c)no change
(d)becomes zero

14-An athlete runs before long jump to get advantage on
(a)Inertia of motion
(b)Principle of moments
(c)Moment of a force
(d) Frictional force

15-The magnifying power of an astronomical telescope can be decreased by
(a)increasing the focal length of the objective
(b)increasing the focal length of the eyepiece
(c)decreasing the focal length of the eyepiece
(d)None of these

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Ans-

1- a

2- b

3- d

4- a

5- d

6- c

7- b

8- c

9- d

10- c

11- d

12- b

13- a

14- a

15- b

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Physics one-liners for various competitive examinations

Welcome to the Physics Section page.

We know the importance of general awareness, GK (General Knowledge) in various competitive exams for aspirants.

We are publishing general awareness notes and study material on various subjects daily.

These Physics notes are extremely useful for all exams including Bank Exams.

Watch One-Liners 

---

1-Weightlessness experienced in a spaceship is due to___?

2- Which instrument is used to measure the change in volume of substances?

3- Which instrument is used to measure altitudes in aircraft?

4-Who gave the first experimental value of G?

5-The image formed by the convex lens in a simple microscope is__.

6-Force of attraction between the molecules of different substances is called___?

7-Insects can move on the surface of water without sinking due to___.

8-Sudden fall in the barometer is indication of___?

9-The temperature of the sun is measured with ___.

10-What is the working principle of the Washing machine?

11-Coolis tube is used to produce___?

12-What apparatus is used to locate a submerged object?

13-What is the unit of magnetic flux?

14-In summer, the mirages are seen due to the phenomenon of __?

15-Astigmatism can be corrected by__?

16-Distance of stars are measured in___?

17-The total internal reflection can occur when light passes from___.

18-What is the SI unit of luminous intensity?

19-Pure water freezes at what temperature?

20-What type of lens is a magnifying glass?

21-A fast wind can turn the blades of a windmill because it possesses__.

22-Nature of the sound wave is ____?

23-What is the name of short duration wave?

24-In which medium sound travels faster?

25-If the temperature inside a room is increased, the relative humidity will?

Ans-

1-Absence of Gravity
2-Dilatometer
3-Altimeter
4-Cavendish
5-Virtual & Erect
6-Adhesive Force
7- Surface tension of water
8-Storm
9-Pyrometer
10-Centrifugation
11-X-Rays
12-SONAR
13- Maxwell
14-Total Internal Reflection
15-Cylindrical lenses
16-Light Years
17-Denser to Rarer medium
18-Candela
19-32 F
20-Convex lens
21-Potential Energy
22-Longitudinal
23-Pulse
24-Solid
25- Decrease

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Physics one-liners for various competitive examinations

Welcome to the Physics Section page.

We know the importance of general awareness, GK (General Knowledge) in various competitive exams for aspirants.

We are publishing general awareness notes and study material on various subjects daily.

These Physics notes are extremely useful for all exams including Bank Exams.

Watch One-Liners

---

 

Gravitational Force

 

Gravitational Force- It is the force of mutual attraction between any two objects by virtue of their masses.

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* It is a universal force.

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* All objects on the earth experience the force of gravity due to the earth.

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* It is gravity that governs the motion of the moon and artificial satellites around the earth, the motion of the earth and planets around the sun.

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* Gravitational Force plays a key role in the large-scale phenomena of the universe, such as formation and evolution of stars, galaxies.

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* The gravitational pull of the moon pulls the seas towards it, causing the ocean tides.

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* The gravitational force was discovered by Sir Isaac Newton in 1687.

 

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* Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is.

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* The sun’s gravity keeps Earth in orbit around it, keeping us at a comfortable distance to enjoy the sun’s light and warmth.

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* Gravity is slightly stronger over places with more mass underground than over places with less mass.

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* The value of gravitational force is 9.8 m/s2 on Earth. The acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2.

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* Astronauts float around in space because there is no gravity in space.

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* When we throw a stone upwards from earth it falls down to the earth due to the gravitational force of earth.

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* The moon is orbiting around earth due to the gravitational force of the earth. Planets are orbiting around sun due to the gravitational force of the sun.

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* According to Newton’s law of gravitation, The gravitational force is directly proportional to the product of the two masses and inversely proportional to the square of the distance between them.

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* Gravitational force is the weakest force among the four fundamental forces of nature.

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