NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Physics MCQs (Practice_Test 5 of 35)
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- Assertion (A) : The lines of magnetic field (B vector) are always closed curves and they surround the conductors carrying the current that set up the field.
- Reason (R) : The poles (a source or a sink) of magnetic B-flux are absent.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Assertion (A) : A temperature gradient (positive or negative) occurs between the two junctions of a thermocouple when current is passed through it.
- Reason (R) : Free electron density is different in different metals.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Assertion (A) : Electron capture process is followed by emission of characteristic X-rays.
- Reason (R) : Gamma-ray photon emitted by excited nucleus after electron capture, subsequently ejects electron from K or L shell.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Assertion (A) : The electrons that come out of the nucleus in the process of beta decay all have the same energy.
- Reason (R) : Neutrons also come out of the nucleus in the process of beta decay.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Assertion (A) : Cadmium is used as control rod material in a nuclear reactor.
- Reason (R) : The isotope Cd-113 constitutes about 12% of natural cadmium.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Assertion (A) : In n-p-n and p-n-p transistor, the collector current is less than the emitter current.
- Reason (R) : All the current carriers constituting emitter current do. Not reach the collector.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Assertion (A) : In both vacuum diode and triode, the plate is usually made up of nickel, iron or molybdenum.
- Reason (R) : Nickel, iron and molybdenum easily attract electrons.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Match List I with List II and select the correct answer:
Table Supporting: NET, IAS, State-SET (KSET, WBSET, MPSET, Etc.) , GATE, CUET, Olympiads Etc. : Physics MCQs (Practice_Test 5 of 35) List-I (Quantities of rotational motion) List-II (Their dimensions) - Energy
- Moment of Inertia
- Angular acceleration
- Angular momentum
- M1L2T β 1
- M1L2T0
- M1L2T β 2
- M0L0T β 2
- A
- B
- C
- D
- 3
- 4
- 2
- 1
- 1
- 3
- 4
- 2
- 4
- 2
- 1
- 3
- 3
- 2
- 4
- 1
- If P is the pressure of a gas and? is is its density, then dimension of velocity is given by
- P ?
- P ?
- P- ?
- P- ?
- Two particles A and B, initially at rest, move towards each other under a mutual force of attraction. If, at an instant, the speed of A is βvβ and that of B is β2vβ then the speed of the centre of mass of the system is
- zero
- v
- 1.5 v
- 3 v
- If a diver jumping off a high springboard near a swimming pool can perform a variety of physical movements in the air before entering the water below, then the parameter that will remain constant during the fall is
- linear velocity
- linear momentum
- angular velocity
- angular momentum