Description : The following processes depend on changes in membrane conductance to Na and K. a. Action potential b. depolarization c. repolarization d. all of them
Last Answer : all of them
Description : In the neurone: a. the magnitude of the action potential is dependent on the strength of the stimulus b. impulses can travel in both direction c. depolarization is accompanied by increased ... potassium ions d. during depolarization, the potential of the neurone changes from -70mV to +40mV
Last Answer : during depolarization, the potential of the neurone changes from -70mV to +40mV
Description : Reciprocal of permeability is (a) reluctivity (b) susceptibility (c) permittivity (d) conductance
Last Answer : (a) reluctivity
Description : Pick out the wrong statement. (A) Reciprocal of the resistance to heat flow is called thermal conductance (B) Unit of thermal conductance is W/°K (C) Thermal conductance of a wall of thickness 'L', thermal conductivity 'k' and heat flow area 'A' is kL/A (D) None of these
Last Answer : (C) Thermal conductance of a wall of thickness 'L', thermal conductivity 'k' and heat flow area 'A' is kL/A
Description : In cardiac cells, adenosine (a) Causes shortening of action potential duration (b) Depolarization (c) Increase in normal automaticity (d) All of the above
Last Answer : Ans: A
Description : Regarding verapamil, which one of the following statements is false? (a) Angina pectoris is an important indication for the use of verapamil (b) Contraindicated in the asthmatic patient (c) ... phase of the action potential in AV nodal cells (e) Used in management of supraventricular tachycardias
Last Answer : Ans: B
Description : Propagation of action potential is called a. Repolarization b. depolarization c. nerve impulse d. none of them
Last Answer : nerve impulse
Description : The most significant feature of the antiarrhythmic action of lignocaine is: A. Suppression of phase-4 depolarization in ventricular ectopic foci B. Prolongation of action potential duration C. Prolongation of effective refractory period D. Depression of membrane responsiveness
Last Answer : A. Suppression of phase-4 depolarization in ventricular ectopic foci
Description : The electrophysiological effects of digitalis on Purkinje fibres include the following except: A. Enhancement of resting membrane potential B. Decrease in the slope of phase-0 depolarization C. Increase in the rate of phase-4 depolarization D. Abbreviation of action potential duration
Last Answer : A. Enhancement of resting membrane potential
Description : Conductance is reciprocal of?
Last Answer : Conductance is reciprocal of resistance.
Description : The effect of noradrenaline on the heart include: a. tachycardiac b. increased duration of the cardiac action potential c. decreased potassium conductance of the membranes of pacemaker cells d. increased strength of cardiac contraction
Last Answer : increased strength of cardiac contraction
Last Answer : Reciprocal of permeability is reluctivity.
Description : Consider the following statements: 1. When a nerve fibre is stimulated, a profound change is produced in the electrical properties of surface membrane and in steady potential. 2. Upon excitation, the resting potentialis suddenly changed. 3. It is due ... 1, 2, 3 (b) 2, 3 (c) 1, 2, 3, 4 (d) 1, 2, 4
Last Answer : Ans:(d)
Description : The following are true about an action potential in a nerve fibre: a. it occurs when its membrane potential is hyperpolarized b. it is associated with a transient increase in membrane ... permeability to potassium d. it has an amplitude which varies directly to the strength of stimulus
Last Answer : there is a decreased in membrane permeability to potassium
Description : Anthelmintic action of piperazine is due to: A. Interference with ATP generation in the worm B. Blockade of glucose uptake by the worm C. Hyperpolarization of nematode muscle by GABA agonistic action D. Depolarization of nematode muscle by activating nicotinic receptors
Last Answer : C. Hyperpolarization of nematode muscle by GABA agonistic action
Description : The most probable mechanism of action of mebendazole is: A. Depolarization of membrane and spastic paralysis of the worm B. Hyperpolarization of membrane and flaccid paralysis of the worm C. Loss of ... inhibition of glucose uptake in the worm D. Tegument damage and leakage of contents of the worm
Last Answer : C. Loss of intracellular microtubules and inhibition of glucose uptake in the worm
Description : Which physical quantity is measured in ‘siemens’? (1) Electric potential (2) Electrical conductance (3) Magnetic flux (4) Refractive index
Last Answer : (2) Electrical conductance Explanation: The Siemens is the unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).
Description : How do I work out the area or length of a wire when I only know the resistance/conductance and the length/area?
Last Answer : if cunductance = conductivity x area/length then length = conductivity / conductance x Area i think, if the equation is transposed correctly, it’s been a while since school maths. better check that one though.
Description : The leakage current in the transmission lines is referred to as the a) Resistance b) Radiation c) Conductance d) Polarisation
Last Answer : Ans: C
Description : Which of the following parameters is not a primary parameter? a) Resistance b) Attenuation constant c) Capacitance d) Conductance
Description : 'Farad' is the unit of : (1) Capacitance (2) Inductance (3) Resistance (4) Conductance
Last Answer : (1) Capacitance Explanation: The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
Description : Safety fuse wire used in domestic electrical appliances is made of metal of low (1) Resistance (2) Melting point (3) Specific gravity (4) Conductance
Last Answer : (2) Melting point Explanation: The fuse wire is based on the Joules law of heating which says that when the electric current is allowed to pass through a conductor, the conductor heats up and is ... . For this purpose the material used as fuse wire should have high resistance and low melting point.
Description : Most conducting materials such as copper, aluminum, iron, nickel, and tungsten _____________. A. increase in resistance with increased temperature B. increase in resistance with decreased ... C. decrease in resistance with increased temperature D. increase in conductance with increased temperature
Last Answer : Answer: A
Description : In transmission line, which of the following is the first step in the procedure of using stub matching? A. Calculate stub susceptance. B. Calculate load admittance C. Connect stub to load D. Transform conductance to resistance
Last Answer : B. Calculate load admittance
Description : A material with zero resistivity is said to have a) Zero conductance b) Infinite conductance c) Zero resistance d) Infinite resistance
Last Answer : c) Zero resistance
Description : What is the relationship between conductance and resistance?
Last Answer : They are reciprocals of each other.
Description : ‘Farad’ is the unit of : (1) Capacitance (2) Inductance (3) Resistance (4) Conductance
Last Answer : Capacitance
Last Answer : Melting point
Description : Define with respect to FET:- (i) Static drain resistance (ii) Dynamic resistance (iii) Trans conductance (iv) Pinch-off voltage
Last Answer : (i) Static drain resistance- It is the ratio of drain source voltage (ΔVDS) to the drain current (ID) at constant gate-source voltage. It can be expressed as, Rd = (VDS)/(ID) at ... of charge carrier and the value of drain current reaches its constant saturation value is called pinch off voltage.
Description : Which of the following statements is true concerning simple parallel resistance circuits? A. The total current flow equals the sum of the individual currents. B. The total current flow equals the ... resistance. D. The total voltage equals the sum of the individual voltages across each resistance.
Description : Which of the following statements concerning a simple parallel resistance circuit is correct? A. The voltage drop across each resistor is the same. B. The total current flow equals the reciprocal ... resistances. D. The total voltage equals the sum of the individual voltages across each resistance.
Description : Pick up the incorrect statement from the following: The torsional resistance of a shaft is directly proportional to (A) Modulus of rigidity (B) Angle of twist (C) Reciprocal of the length of the shaft (D) Moment of inertia of the shaft section
Last Answer : (D) Moment of inertia of the shaft section
Description : Reciprocal of resistivity is called a. Resistance b. Inductance c. Conductivity d. Flexibility
Last Answer : c. Conductivity
Description : what is the reciprocal of resistance ?
Last Answer : reciprocal of resistance is conductance.
Description : The resting membrane potential of a cell a. is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+ b. falls to zero immediately when Na+ ... the equilibrium potential for Na+ e. is markedly altered if the extracellular Na+ concentration is increased
Last Answer : is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+
Description : Gauss law can be used to compute which of the following? a) Permittivity b) Permeability c) Radius of Gaussian surface d) Electric potential
Last Answer : c) Radius of Gaussian surface
Description : For a homogeneous earth dam 50 m high having 2 m free broad, a flow net was constructed and the results were : Number of potential drops = 2.4 Number of flow channels = 0.4. If co-efficiency of permeability of the dam material is ... 24 10-3 m3 /sec (C) 6 10-5 m3 /sec (D) 24 10-5 m3 /sec
Last Answer : (D) 24 × 10-5 m3 /sec
Description : Which of the following is a vector quantity ? (a) Relative permeability (b) Magnetic field intensity (c) Flux density (d) Magnetic potential
Last Answer : (b) Magnetic field intensity
Description : Which of the following agents has a direct effect on the AV mode, delaying calciumchannel depolarization? (a) Lidocaine (b) Diltiazem (c) Bretylium (d) Quinidine (e) Lbutilide
Description : True statements about EOG (electro-oculogram) include: a. the EOG light-peak to dark-trough ratio is reduced in central retinal vein occlusion b. the light peak of EOG is abnormal in Best' ... rise is produced by depolarization of the basal membrane of the retinal pigment epithelium d. all above
Last Answer : all above
Description : The effect of calcium ions on neurotransmitter release at synapses include: a. vesicular fusion b. tonic depolarization of the presynaptic neurone c. post-tetanic potentiation d. all above
Description : In the heart: a. excitation begins in the sinoatrial node b. excitation of the ventricle begins at the apex and spread to the base c. depolarization occurs from epicardium to endocardium d. all above
Description : The following are true about the sodium channels: a. they are made up of polypeptide chains b. have the highest densities at the nodes of Ranvier c. open in response to depolarization d. remain open as long as depolarization is maintained
Last Answer : have the highest densities at the nodes of Ranvier
Description : Which process begins after Na influx essentially stops at its plateu a. Depolarization b. Repolarization c. both d. none
Last Answer : Repolarization
Description : Depolarization of axolemma during nerve conduction takes place because of (a) equal amount of Na+ and K+ move out across axolemma (b) Na+ move inside and K+ move more outside (c) more Na+ outside (d) none of these.
Last Answer : (b) Na+ move inside and K+ move more outside
Description : Which of the following ECG waveforms characterizes conduction of an electrical impulse through the left ventricle? a) QRS complex The QRS complex represents ventricular depolarization b) P ... QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.
Last Answer : a) QRS complex The QRS complex represents ventricular depolarization
Description : Which of the following ECG characteristics is usually seen when a patient's serum potassium level is low? a) U wave The U wave is an ECG waveform characteristic that may ... interval The QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.
Last Answer : a) U wave The U wave is an ECG waveform characteristic that may reflect Purkinje fiber repolarization. It is usually seen when a patient’s serum potassium level is low.
Description : The antiarrhythmic drug which decreases both rate of depolarization (phase 0) as well as rate of repolarization (phase 3) of myocardial fibres is: A. Lignocaine B. Propranolol C. Quinidine D. Verapamil
Last Answer : C. Quinidine
Description : Local anaesthetics block nerve conduction by: A. Blocking all cation channels in the neuronal membrane B. Hyperpolarizing the neuronal membrane C. Interfering with depolarization of the neuronal membrane D. Both ‘B’ and ‘C’ are correct
Last Answer : C. Interfering with depolarization of the neuronal membrane
Description : The GABAB receptor: A. Is an intrinsic ion channel containing receptor B. Mediates neuronal depolarization C. Is insensitive to blockade by bicuculline D. Regulates intracellular cAMP
Last Answer : C. Is insensitive to blockade by bicuculline