Physics - Online Test
Q1. Photon has a charge of
Answer : Option A
Explaination / Solution:
Photon has no charge. Photon is the packets of energy.
Q2. Transmitter is a device that
Answer : Option D
Explaination / Solution:
A transmitter is a set up that transmits the message to the receiving end through a communication channel.its main function is to modify the message signal in a form suitable for transmission over the channel and to transmit it.The transmitter is able to generate a radio frequency alternating current that is then applied to the antenna, which, in turn, radiates this as radio waves. There are many types of transmitters depending on the standard being used and the type of device; for example, many modern devices that have communication capabilities have transmitters such as Wi-Fi, Bluetooth, NFC and cellular.
Q3. For a ball dropped from a tower of height h the total mechanical energy is
Answer : Option C
Explaination / Solution:
mechanical energy = sum of potential and kinetic energies
a falling ball will have both these energies in between topmost and bottomost points of its motion so mechanical energy is the sum of potential and kinetic energies.
Q4.
If are components of vectors A and B along the x and y axis then the sum of the vectors A and B has a component in the x direction equal to
Answer : Option B
Explaination / Solution:
The component method of addition can be summarized this way:
- Using trigonometry, find the x-component and the y-component for each vector.
- Add up both x-components, (one from each vector), to get the x-component of the total.
- Add up both y-components, (one from each vector), to get the y-component of the total.
- Add the x-component of the total to the y-component of the total, and then use the Pythagorean theorem and trigonometry to get the size and direction of the total.
Using these points in mind, the sum of the vectors A and B has a component in the x direction
Q5. According to superposition of electric fields
Answer : Option B
Explaination / Solution:
When several electric fields are working on single charge then the total electric field intensity on that charge is given by the vector sum of all electric field intensities
Q6. With reference to figure the tensile stress corresponds to stress at point
Answer : Option B
Explaination / Solution:
The point D on the graph is the ultimate tensile strength of the material. Beyond this point , additional strain is produced even by a reduced applied force and fracture occurs at point E.
After point D thinning of wire started and finally the wire breaks.
So D shows tensile strength.
Q7. In a quasi-static process,
Answer : Option C
Explaination / Solution:
A quasi-static process is a thermodynamic process that happens slowly enough for the system to remain in internal equilibrium.
Q8. Which of these statements about Bohr model is correct?
Answer : Option D
Explaination / Solution:
No Explaination.
Q9. The basic laws of physics are universal means
Answer : Option C
Explaination / Solution:
Laws of nature as expressed in physics as laws and theories are often said to be universal. This means that, so far as we have been able to test them, they apply everywhere and at every time, past, present and future.
Q10. When bodies are in contact with each other then
Answer : Option A
Explaination / Solution:
according to newton's third law of motion for every action there is always equal and opposite reaction or the mutual actions of two bodies upon each other. Whenever two objects interact with each other, then the pair of forces acting on them are equal in magnitude and opposite in direction.
Contact forces are mutual forces (action and reaction)
