Physics Quiz 2
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Question 1 |
Which of the following is not a fundamental unit?
A | newton |
B | kilogram |
C | metre |
D | second |
Question 2 |
In SI units the number of basic physical quantities are
A | 3 |
B | 7 |
C | 9 |
D | 21 |
Question 3 |
Light year is
A | light emitted by the sun in one year |
B | time taken by light to travel from sun to earth |
C | the distance travelled by light in free space in one year |
D | time taken by earth to go once around the sun |
Question 4 |
Practical unit of heat is
A | Calorie |
B | Horse power |
C | Joule |
D | Watt |
Question 5 |
Which one among the following is correct for resultant of balanced forces?
A | It is zero |
B | It is non -zero |
C | It varies continuously |
D | None of the above |
Question 6 |
When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by
A | the theory of relativity |
B | Newton’s first law |
C | Newton’s second law |
D | Newton’s third law |
Question 7 |
A book is kept on the surface of a table. If the gravitational pull of the earth on the book is the force of action, then the force of reaction is exerted by
A | the book on the table |
B | the book on the earth |
C | the table on the book |
D | the table on the earth |
Question 8 |
An astronaut in the orbit in a spacecraft feels weightlessness
A | due to the absence of gravity inside |
B | due to the face that space craft has no energy |
C | because acceleration in the orbit is equal to
acceleration of gravity outside |
D | their is no gravity outside |
Question 9 |
If the moon is to escape from the gravitational field of the earth forever, it will require a velocity
A | 11.2 km/s |
B | less than 11.2 km/s |
C | slightly more than 111.2 km/s |
D | 22.4 km/s |
Question 10 |
In respect of the difference of the gravitational force from electric and magnetic forces, which one of the following statements is true ?
A | Gravitational force is stronger than the other two. |
B | Gravitational force is attractive only, whereas the
electric and the magnetic forces are attractive as well
as repulsive |
C | Gravitational force has a very short range |
D | Gravitational force is a long range force, while the
other two are short range forces |
Question 11 |
The turntable of a gramophone is rotated at a constant speed of x revolutions/minute. Which one of the following values of the revolutions per minute is not used ?
A | 78 r.p.m. |
B | 56 r.p.m. |
C | 45 r.p.m. |
D | 33 r.p.m. |
Question 12 |
Why is sound heard with more intensity through CO2 than through the air ?
A | Density of CO2 is more than that of air |
B | Density of CO2 is less than that of air |
C | Air is bad conductor of heat |
D | CO2 is a compound, but air is a mixture of gases |
Question 13 |
Which one of the following properties distinguishes ultrasound from normal audible sound?
A | Intensity |
B | Speed of propagation |
C | Frequency |
D | Quality |
Question 14 |
Two pieces of conductor of same material and of equal length are connected in series with a cell. One of the two pieces has cross-sectional area double that of the other. Which one of the following statements is correct in this regard ?
A | The thicker one will allow stronger current to pass
through it |
B | The thinner one would allow stronger current to pass
through it. |
C | Same amount of electric current would pass through
both the pieces producing more heat in the thicker
one. |
D | Same amount of electric current would pass through
both the pieces producing more heat in the thinner
one. |
Question 15 |
Magnetism of a bar magnet can be destroyed if it is
- kept in the magnetic meridian.
- placed in a direction opposite to that of the Earth'shorizontal intensity.
- heated to a temperature known as Curie temperature.
A | I and III only |
B | II only |
C | II and III only |
D | I, II and III |
Question 16 |
A wire of resistance 16 W is bent in the form of a circle. What is the effective resistance between diametrically opposite points?
A | 1 W |
B | 2 W |
C | 4 W |
D | 8 W |
Question 17 |
Fluorescent tubes are fitted with a choke. The choke coil :
A | steps up the line voltage |
B | steps-down the line voltage |
C | reduces current in the circuit |
D | chokes low frequency current |
Question 18 |
If an a-particle is projected normally through a uniform magnetic field, then the path of the a-particle inside the field will be
A | circular |
B | parabolic |
C | elliptical |
D | a straight line |
Question 19 |
Which one of the following is correct about The wavelength of the X-rays
A | is longer than the wavelength of sound waves |
B | is longer than the wavelength of the yellow sodium
light |
C | is longer than the wavelength of radio waves |
D | is of the order of 0.1 nanometer |
Question 20 |
Light Emitting Diode (LED) converts
A | light energy into electrical energy |
B | electrical energy into light energy |
C | thermal energy into light energy |
D | mechanical energy into electrical energy |
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