Goyal Brothers Prakashan Class 9 Physics Workbook Solutions. We covered all the Goyal Brothers Prakashan Class 9 Physics Workbook Solutions in this post for free so that you can practice well for the exam.
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Goyal Brothers Prakashan Class 9 Physics Workbook MCQs for Students
The supply voltage to a room is 120 V. The resistance of the lead wires is 69. A 60 W bulb is already switched on. What is the decrease in voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?
(A) zero volt
(B) 2.9 volt
(C) 13.3 volt
(D) 10.40 volt
Option d – 10.40 volt
The current in the conductor varies with time t as I = 2t + 3t². Electric charge flows through a section of the conductor from t = 2 sec to t = 3 sec is ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(A) 10 C
(B) 24 C
(C) 33 C
(D) 44 C
Option b – 24 C
Few resistance each of value R is connected as shown in the following diagram. The effective resistance between points A and B is
(A) 2R Ω
(B) 4R/3 Ω
(C) 2 R/3 Ω
(D) R Ω
Option c – 2 R/3 Ω
The resistances in the left and right gaps of a meter bridge are 20Ω and 30 Ω respectively. When the resistance in the left gap is reduced to half its value, the balance point shifts by : ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(A) 15 cm to the right
(B) 15 cm to the left
(C) 20 cm to the right
(D) 20 cm to the left
Option b – 15 cm to the left
What will be the change in the potential gradient of the wire if one wire is replaced by another wire of double diameter in the potentiometer experiment if the initial potential gradient is Vo?
(A) Vo
(B) 2 Vo
(C) Vo/2
(D) O
Option d – O
A cannonball is fired from a cannon. The force on the ball is given by F = 10t² – t – 2, where F is in newtons and t in seconds. The force on the ball becomes zero as soon as it leaves the cannon. What is the average impulse imparted to the ball? ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(A) 909 Ns
(B) 394.17 Ns
(C) 71.09 Ns
(D) zero
Option b – 394.17 Ns
The natural frequency of an LC circuit is 75 kHz. When the capacitor is totally filled with a dielectric material, the natural frequency decreases by 15 kHz. The dielectric constant of the material is nearly
(A) 3.33
(B) 2.12
(C) 1.56
(D) 1.91
Option c – 1.56
The diode used for detecting optical signals is ……… ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(A) Zener diode
(B) photodiode
(C) LED
(D) junction diode
Option b – photodiode
Two tuning forks A and B vibrating simultaneously produce 7 beats. The frequency of B is 512 Hz. It is seen that if one arm of A is filed, then the number of beats increases. The frequency of A will be
(A) 502 Hz
(B) 507 Hz
(C) 517 Hz
(D) 519 Hz
Option d – 519 Hz
A body of mass 4 kg strikes elastically with another body at rest and continues to move in the same direction with one-fourth of its initial velocity. The mass of the other body is
(A) 0.6 kg
(B) 2.4 kg
(C) 3.0 kg
(D) 4.0 kg
Option b – 2.4 kg
The amount of work done in increasing the voltage across the plates of the capacitor from 3 V to 6 V is ‘W’. The work done in increasing it from 6 V to 9 V will be ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(A) W
(B) 0.6 W
(C) 1.25 W
(D) 1.67 W
Option d – 1.67 W
A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and negligible internal resistance. The potentiometer wire itself is 4 m long. When the resistance R, connected across the given cell, has values of i. infinity ii. 10 Ω the balancing lengths on the potentiometer wire are found to be 2.72 m and 2.6 m, respectively. The value of the internal resistance of the cell is
(Α) 0.25 Ω
(Β) 0.98 Ω
(C) 0.46 Ω
(D) 0.73 Ω
Option c – 0.46 Ω
The surface energy of a liquid drop is U. It is split into 125 equal droplets. Then its surface energy becomes ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(A) 5 U
(B) 25 U
(C) 100 U
(D) 125 U
Option a – 5 U
If the ratio of gravitational acceleration at point A to point B is zero, then
(A) point A is at a height equal to the radius of the earth above the surface and point B is at a depth equal to the half radius of the earth below the surface.
(B) point A is at a height equal to the half radius of the earth above the surface and point B is the north pole of the earth.
(C) point A is at a depth equal to the half radius of the earth below the surface and point B is the south pole.
(D) point A is the center of the earth and point B is at a height equal to the radius of the earth above the surface of the earth.
Option d – point A is the center of the earth and point B is at a height equal to the radius of the earth above the surface of the earth.
A particle executes SHM of period 1.5 s and amplitude 10 cm. The time it takes to travel 4 cm from the positive extremity of its oscillation is (Given: cos 53° = 0.6)
(A) 0.17 s
(B) 0.22 s
(C) 0.41 s
(D) 0.41 s
Option b – 0.22 s
A parallel beam of fast-moving electrons is incident normally on a narrow slit. A screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statement is correct?
(A) The angular width of the central maxima will remain the same.
(B) The angular width of the central maxima will decrease.
(C) The angular width of the central maxima of the diffraction pattern will increase.
(D) The diffraction pattern is not observed on the screen in the case of electrons.
Option b – The angular width of the central maxima will decrease.
An aircraft loops the loop of radius 600 m with a velocity of 360 km/h at the lowest point. The force on the flyer of mass 75 kg, in the lower part of the loop, is (Take g = 10 m/s²)
(A) 1400 N.
(B) 1800 N.
(C) 2100 N.
(D) 2000 N.
Option d – 2000 N.
Newton’s universal law of gravitation applies to ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) small bodies only
(b) planets only
(c) both small and big bodies
(d) only valid for the solar system
Option c – both small and big bodies
Two identical spheres of gold are in contact with each other. The gravitational attraction between them is
(a) directly proportional to the square of the radius
(b) directly proportional to the cube of the radius
(c) directly proportional to the fourth power of the radius
(d) inversely proportional to the square of the radius
Option c – directly proportional to the fourth power of the radius
Two masses m1 and m₂ (m₁ <m₂) are released from rest from a finite distance. They start under their mutual gravitational attraction
(a) acceleration of m, which is more than that of m₂.
(b) acceleration of m₂ is more than that of m₁.
(c) centre of mass of the system will remain at rest in all the reference frames
(d) total energy of the system remains constant
Option a – acceleration of m, which is more than that of m₂
The gravitational force Fg between two objects does not depend on ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) the Sun of masses
(b) the product of masses
(c) the distance between masses
(d) the Gravitational constant
Option a – the Sun of masses
The atmosphere is held to the earth by ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) winds
(b) clouds
(c) Gravity
(d) None of these
Option c – Gravity
Two air bubbles in water
(a) attract each other
(b) repel each other
(c) neither attract nor repel
(d) None of these
Option a – attract each other
The tides in the sea are primarily due to the ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) atmospheric effect of the earth.
(b) the gravitational effect of venus on the earth
(c) the gravitational effect of the sun on the earth
(d) the gravitational effect of the moon on the earth
Option d – the gravitational effect of the moon on the earth
The weight of a body at the centre of the earth is ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) zero
(b) infinite
(c) the same as on the surface of the earth
(d) none of these
Option a – zero
If the earth is at one-fourth of its present distance from the sun, the duration of the year will be
(a) half the present year
(b) one-eight the present year
(c) one-fourth of the present year
(d) one-sixth of the present year
Option b – one-eight the present year
Kepler’s second law regarding constancy of the areal velocity of a planet is a consequence of the law of conservation of ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) energy
(b) angular momentum
(c) linear momentum
(d) None of these
Option b – angular momentum
A missile is launched with a velocity less than escape velocity. The sum of its kinetic and potential energies is ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) zero
(b) negative
(c) positive
(d) may be positive, negative or zero.
Option b – negative
Due to the rotation of the earth the acceleration due to gravity g is
(a) maximum at the equator and minimum at the poles
(b) minimum at the equator and maximum at the poles
(c) same at both places
(d) None of these
Option b – minimum at the equator and maximum at the poles
There is no atmosphere on the moon because ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) it is closer to the earth
(b) it revolves around the earth
(c) it gets light from the sun
(d) the escape velocity of gas molecules is lesser than their root mean square velocity
Option d – the escape velocity of gas molecules is lesser than their root mean square velocity
A satellite is orbiting around the earth near its surface. If its kinetic energy is doubled, then
(a) it will remain in the same orbit.
(b) it will fall on the earth.
(c) it will revolve with greater speed.
(d) it will escape out of the gravitational field of the earth.
Option d – it will escape out of the gravitational field of the earth
The period of a satellite in a circular orbit near a planet is independent of ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) the mass of the planet
(b) the radius of the planet
(c) the mass of the satellite
(d) All of the above
Option c – the mass of the satellite
In planetary motion ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) the angular speed remains constant
(b) the total angular momentum remains constant
(c) the linear speed remains constant
(d) neither the angular momentum nor angular speed remains constant
Option b – the total angular momentum remains constant
To an astronaut in a spaceship, the sky appears black due to
(a) the absence of atmosphere in his neighbourhood.
(b) light from the sky is absorbed by the medium surrounding him
(c) the fact at that height, sky radiations are only in the infra-red and the ultraviolet region
(d) None of these
Option a – the absence of atmosphere in his neighbourhood
Weightlessness experienced while orbiting the earth in a spaceship is the result of ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) inertia
(b) acceleration
(c) zero gravity
(d) centre of gravity
Option c – zero gravity
As we go from the equator to the poles, the value of g
(a) remains the same
(b) decreases
(c) increases
(d) decreases upto latitude of 45°
Option c – increases
A man waves his arms while walking. This is to ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) keep constant velocity
(b) ease the tension
(c) increase the velocity
(d) balance the effect of earth’s gravity
Option d – balance the effect of earth’s gravity
At sea level, a body will have a minimum weight at
(a) pole
(b) equator
(c) 42° south latitude
(d) 37° north latitude
Option b – equator
If the earth losses its Gravity, then for a body ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) weight becomes zero, but not the mass
(b) mass becomes zero, but not the weight
(c) both mass and weight become zero
(d) neither mass nor weight become zero
Option a – weight becomes zero, but not the mass
A small satellite is revolving near earth’s surface. It’s orbital velocity will be nearly ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) 8 km/sec
(b) 11.2 km/sec
(c) 10 km/sec
(d) 6 km/sec
Option a – 8 km/sec
The escape velocity of an object projected from the surface of a given planet is independent of ( Goyal Brothers Prakashan Class 9 Physics MCQs )
(a) radius of the planet
(b) the direction of projection
(c) the mass of the planet
(d) None of these
Option b – the direction of projection
Two identical pipes are sounding notes of frequency 500 Hz. The air temperature in both is 25°C. The temperature of the air in one pipe is increased to 30°C. How many beats are heard per second, when both pipes are blown?
1. Two
2. One
3. Four
4. Three
Option 3 – Four
A locomotive approaching a crossing at a speed of 82 miles/hour sounds a whistle of frequency 400 cycles/sec. When 1.00 miles from the crossing. There is no wind and the speed of sound in the air is 0.200 miles/sec. What frequency is heated by an observer 0.60 miles on the straight road from the crossing at a right angle? ( Goyal Brothers Prakashan Class 9 Physics MCQs )
1. 242 vibrations/sec
2. 442 vibrations/sec
3. 450 vibrations/sec.
4. None of above
Option 2 – 442 vibrations/sec
The microwave which travels with the speed of light is dv reflected from a distant airplane approaching the wave source, It is found that when the reflected waves beat against the wave radiating from the source, the beat frequency is 990 cycles/sec. If the microwave is 0.01 meter in wavelength, what is the approach speed of an airplane?
1. 59.5 m/sec.
2. 49.5 m/sec.
3. 39.9 m/sec.
4. 69.5 m/sec.
Option 2 – 49.5 m/sec
On a calm day, the pitch of an engine whistle drops to (4/5)th of its value as it passes you. If the temperature of the day is 20°C. Find the velocity of the engine, the velocity of sound at 0°C is 332 m/sec. ( Goyal Brothers Prakashan Class 9 Physics MCQs )
1. 38.2 m/sec.
2. 48.2 m/sec.
3. 46.2 cm/sec.
4. 42.6 m/sec.
Option 1 – 38.2 m/sec
If the earth is moving towards a stationary star at a speed of 30 kilometers per second, find the apparent wavelength of light emitted from the star. The real wavelength has the value 5875A°.
1. 5600A
2. 5863 A
3. 5874.41A
4. 5983A
Option 3 – 5874.41A
In a non-dispersive medium group, velocity is ( Goyal Brothers Prakashan Class 9 Physics MCQs )
1. greater than the phase velocity
2. less than the phase velocity
3. independent of phase velocity
4. equal to the phase velocity
Option 4 – equal to the phase velocity
The velocity of sound in air at 4°C is 340 m/s. What will it be when the pressure of the gas is doubled and its temperature is raised to 157°C?
1. 420 m/s
2. 416.41 m/s
3. 416.4 m/s
4. 816.4 m/s
Option 2 – 416.41 m/s
The speed of sound in hydrogen is 1270 m/sec. What will be the speed in a mixture of oxygen and hydrogen mixed in a volume ratio 1 : 4 ( Goyal Brothers Prakashan Class 9 Physics MCQs )
1. 635 m/s
2. 635 cm/s
3. 1230 m/s
4. none of above
Option 1 – 635 m/s
Two tuning forks with natural frequencies of 340 Hz. move relative to a stationary observer. One fork moves away from the observer, while the other moves towards him at some speed. The observer hears beats of frequency 3 Hz. Find the speed of the tuning fork, and the speed of sound in air at the given temperature.
1. 1.8 m/s
2. 1.4 m/s
3. 1.2 m/s
4. 1 m/s
Option 2 – 1.4 m/s
Columns of air at 51°C and a tuning fork produce 4 beats per second when sounded together. As the temperature of the air column is decreased the number of beats per second tends to decrease and when the temperature is 16°C the two produce 1 beat per second. Find the frequency of the tuning fork.
1. 50 Hz
2. 500 Hz
3. 250 Hz
4. 100 Hz
Option 1 – 50 Hz
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