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Physics · PYQ NEET UG 2019(1)
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Physics · PYQ NEET UG 2019(1)
An electron is accelerated through a potential difference of \( 10,000\text{ V} \). Its de Broglie wavelength is, (nearly) (\( m_e = 9 \times 10^{-31}\text{ kg} \))
Read answer →Physics · PYQ NEET UG 2019(1)
Increase in temperature of a gas filled in a container would lead to:
Read answer →Physics · PYQ NEET UG 2019(1)
Two point charges A and B, having charges \( +Q \) and \( -Q \) respectively, are placed at certain distance apart and force acting between them is \( F \). If \( 25\% \) charge of A is transferred to B, then force between the charges becomes:
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At a point A on the earth's surface the angle of dip, \( \delta = +25^\circ \). At a point B on the earth's surface the angle of dip, \( \delta = -25^\circ \). We can interpret that:
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A copper rod of \( 88\text{ cm} \) and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is: (\( \alpha_{\text{cu}} = 1.7 \times 10^{-5}\text{ K}^{-1} \) and \( \alpha_{\text{Al}} = 2.2 \times 10^{-5}\text{ K}^{-1} \))
Read answer →Physics · PYQ NEET UG 2019(1)
In the circuits shown below, the readings of the voltmeters and the ammeters will be:
Read answer →Physics · PYQ NEET UG 2019(1)
The speed of swimmer in still water is \( 20\text{ m/s} \). The speed of river water is \( 10\text{ m/s} \) and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes w.r.t. north is given by:
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Two similar thin equiconvex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is \( F_1 \). When the space between the lenses is filled with glycerin (which has the same refractive index (\( \mu = 1.5 \)) as that of glass) then the equivalent focal length is \( F_2 \). The ratio \( F_1 : F_2 \) will be:
Read answer →Physics · PYQ NEET UG 2019(1)
A particle moving with velocity \( \vec{v} \) is acted by three forces shown by the vector triangle PQR. The velocity of the particle will:
Read answer →Physics · PYQ NEET UG 2019(1)
R त्रिज्या का एक बेलनाकार चालक एक नियत धारा प्रवाहित कर रहा है। चालक के केंद्र से दूरी d के साथ चुंबकीय क्षेत्र B के परिमाण का आरेख, किस चित्र द्वारा सही ढंग से दर्शाया गया है:
Read answer →Physics · PYQ NEET UG 2019(1)
A soap bubble, having radius of \( 1\text{ mm} \), is blown from a detergent solution having a surface tension of \( 2.5 \times 10^{-2}\text{ N/m} \). The pressure inside the bubble equals at a point \( Z_0 \) below the free surface of water in a container. Taking \( g = 10\text{ m/s}^2 \), density of water \( = 10^3\text{ kg/m}^3 \), the value of \( Z_0 \) is:
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Pick the wrong answer in the context with rainbow. Which of the above statements is/are NOT correct?
Read answer →Physics · PYQ NEET UG 2019(1)
A disc of radius \( 2\text{ m} \) and mass \( 100\text{ kg} \) rolls on a horizontal floor. Its centre of mass has speed of \( 20\text{ cm/s} \). How much work is needed to stop it?
Read answer →Physics · PYQ NEET UG 2019(1)
A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:
Read answer →Physics · PYQ NEET UG 2019(1)
In which of the following processes, heat is neither absorbed nor released by a system?
Read answer →Physics · PYQ NEET UG 2019(1)
A parallel plate capacitor of capacitance \( 20\text{ }\mu\text{F} \) is being charged by a voltage source whose potential is changing at the rate of \( 3\text{ V/s} \). The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively:
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The work done to raise a mass \( m \) from the surface of the earth to a height \( h \), which is equal to the radius of the earth, is:
Read answer →Physics · PYQ NEET UG 2019(1)
In which of the following devices, the eddy current effect is not used?
Read answer →Physics · PYQ NEET UG 2019(1)
Which colour of the light has the longest wavelength?
Read answer →Physics · PYQ NEET UG 2019(1)
When an object is shot from the bottom of a long smooth inclined plane kept at an angle \( 60^\circ \) with horizontal, it can travel a distance \( x_1 \) along the plane. But when the inclination is decreased to \( 30^\circ \) and the same object is shot with the same velocity, it can travel \( x_2 \) distance. Then \( x_1 : x_2 \) will be:
Read answer →Physics · PYQ NEET UG 2019(1)
Two particles A and B are moving in uniform circular motion in concentric circles of radii \( r_A \) and \( r_B \) with speed \( v_A \) and \( v_B \) respectively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be:
Read answer →Physics · PYQ NEET UG 2019(1)
A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre:
Read answer →Physics · PYQ NEET UG 2019(1)
