Physics - Online Test

Q1. When a car takes a sudden left turn in the curved road, passengers are pushed towards the right due to
Answer : Option A
Explaination / Solution:
No Explaination.


Q2. The particle size of ZnO material is 30 nm. Based on the dimension it is classified as
Answer : Option B
Explaination / Solution:
No Explaination.


Q3. The dimension of 1/µ0ε0 is
Answer : Option B
Explaination / Solution:


Q4. A uniform force of (2iˆ+ ˆj) N acts on a particle of mass 1 kg. The particle displaces from position (3 ˆj + ˆk ) m to (5iˆ+ 3ˆj) m. The work done by the force on the particle is
Answer : Option C
Explaination / Solution:
No Explaination.


Q5. According to ‘plum pudding model’ atoms on the whole are electrically neutral because
Answer : Option C
Explaination / Solution:
No Explaination.


Q6. The center of mass of a system of particles does not depend upon,
Answer : Option D
Explaination / Solution:
No Explaination.


Q7. force is required
Answer : Option D
Explaination / Solution:

force is required to start a stationary object and to stop a moving object due to inertia. Inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force. This is also called law of inertia or newton's first law of motion

Q8. Domestic power supply in India is
Answer : Option B
Explaination / Solution:

The standard voltage and frequency of alternating current supply in India is set to 220 V and 50Hz respectively by the government of India because when power has to be transmitted from a power plant, the biggest challenge is to cut the transmission losses. For this purpose, the current value should be small and potential difference(Voltage) should be more. Also losses are minimal at 50 Hz/60 Hz frequency.

Q9. Electric potential energy of two point charges q and q0 is 
Answer : Option B
Explaination / Solution:

Potential energy of a system of charges is the work done in assembling the charges. Force between two charges q and q0 placed at a distance r apart is Potential energy of the charges is given by
Q10. Density is defined as
Answer : Option C
Explaination / Solution:

Density is defined as the compactness of substance.

Mathematically,

Density(D)=