Question
The work done by the external forces on a system equals the change in:
  1. Total energy.
  2. Kinetic energy.
  3. Potential energy.
  4. None of these.

Answer

  1. Total energy.

Explanation:

When work is done by an external forces on a system, the total energy of the system will change.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

In the nuclear reaction , the values of A and Z are

(a) A = 234, Z = 94

(b) A = 234, Z = 90

(c) A = 238, Z = 94

(d) A = 238, Z = 90

A charge of magnitude 3e  and mass 2m is moving in an electric field . The acceleration imparted to the charge is

(a) 2Ee/3m

(b) 3Ee/2m

(c) 2m/3Ee

(d) 3m/2Ee

The charge of an electron is 1.6 × 10–19 C.  How many electrons strike the screen of a cathode ray tube each second when the beam current is 16 mA

(a) 1017   

(b) 1019

(c) 10–19  

(d) 10–17

An electric dipole is placed at the centre of a sphere then:

An electric wire of length ‘I’ and area of cross-section a has a resistance R ohms. Another wire of the same material having same length and area of cross-section 4a has a resistance of

(a) 4R

(b) R/4

(c) R/16

(d) 16R

Between the plates of a parallel plate condenser, a plate of thickness  and dielectric constant  is placed. In the rest of the space, there is another plate of thickness  and dielectric constant . The potential difference across the condenser will be

(a)  

(b)

(c)

(d)

The size of an atom is of the order of

(a)

(b)  

(c)  

(d)  

An uncharged capacitor is connected to a battery. On charging the capacitor

(a) All the energy supplied is stored in the capacitor

(b) Half the energy supplied is stored in the capacitor

(c) The energy stored depends upon the capacity of the capacitor only

(d) The energy stored depends upon the time for which the capacitor is charged

The diagram shows the path of four a-particles of the same energy being scattered by the nucleus of an atom simultaneously. Which of these are/is not physically possible

(a) 3 and 4

(b) 2 and 3

(c) 1 and 4

(d) 4 only

Which of the following particle has similar mass to electron

(a) Proton

(b) Neutron

(c) Positron

(d) Neutrino