NEET2023

NEET 2023

180 questions with step-by-step solutions. All free.

Physics

Q1 In a series LCR circuit, the inductance $L$ is $10$ mH, capacitance $C$ is $1 μ F$ and resistance $\dots$
Q2The magnitude and direction of the current in the following circuit is:
Q3If the galvanometer $G$ does not show any deflection in the circuit shown, the value of $R$ is given by:
Q4The temperature of a gas is $- 5 0^{\circ}$ C. To what temperature the gas should be heated so that the rms speed is increased by $3$ times?
Q5A Carnot engine has an efficiency of $50%$ when its source is at a temperature $32 7^{\circ}$ C. The temperature of the sink is:
Q6 A bullet is fired from a gun at the speed of $280$ ms $^{- 1}$ in the direction $3 0^{\dots}$
Q7 An electric dipole is placed at an angle of $3 0^{\circ}$ with an electric field of intensity $2 \times 1 \dots$
Q8 Given below are two statements: Statement I: Photovoltaic devices can convert optical radiation into electricity. Statement II: Zener diode is designed to operate under reverse bias in breakdown region. In the light of the above statements, choose the most appropriate answer from the options given below: …
Q9The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is:
Q10 The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are $2.14$ eV, $2.30$ eV and $2.75$ eV respectively. If incident electromagnetic radiation has an incident energy of $2.20$ eV, which of these photosensitive surfaces may emit photoelectrons? …
Q11The minimum wavelength of X-rays produced by an electron accelerated through a potential difference of $V$ volts is proportional to:
Q12 A $12$ V, $60$ W lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $220$ V. Assuming the transformer to be ideal, what is the current in the primary winding? …
Q13Light travels a distance $x$ in time $t_{1}$ in air and $10 x$ in time $t_{2}$ in another denser medium. What is the critical angle for this medium?
Q14 A metal wire has mass $(0.4 \pm 0.002)$ g, radius $(0.3 \pm 0.001)$ mm and length …
Q15 For Young's double slit experiment, two statements are given below: Statement I: If screen is moved away from the plane of slits, angular separation of the fringes remains constant. Statement II: If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases. In the light of the above statements, choose the correct answer from the options given below: …
Q16The half life of a radioactive substance is $20$ minutes. In how much time, the activity of substance drops to $(\frac{1}{16})^{t h}$ of its initial value?
Q17The equivalent capacitance of the system shown in the following circuit is:
Q18Resistance of a carbon resistor determined from colour codes is $(22000 \pm 5%) Ω$ . The colour of third band must be:
Q19An ac source is connected to a capacitor $C$ . Due to decrease in its operating frequency:
Q20A vehicle travels half the distance with speed $v$ and the remaining distance with speed $2 v$ . Its average speed is:
Q21 The amount of energy required to form a soap bubble of radius $2$ cm from a soap solution is nearly: (surface tension of soap solution $= 0.03$ N m $^{\dots}$
Q22The venturi-meter works on:
Q23In hydrogen spectrum, the shortest wavelength in the Balmer series is $λ$ . The shortest wavelength in the Bracket series is:
Q24 The potential energy of a long spring when stretched by $2$ cm is $U$ . If the spring is stretched by $8$ cm, potential energy stored in it will be: …
Q25 A full wave rectifier circuit consists of two p-n junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output? …
Q26The magnetic energy stored in an inductor of inductance $4 μ H$ carrying a current of $2$ A is:
Q27If $\oint_{S} E \cdot d S = 0$ over a surface, then:
Q28The angular acceleration of a body, moving along the circumference of a circle, is:
Q29 In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of $2.0 \times 1 0^{10}$ Hz and amplitude $\dots$
Q30 Two bodies of mass $m$ and $9 m$ are placed at a distance $R$ . The gravitational potential on the line joining the bodies where the gravitational field equals zero, will be ( $G =$ gravitational constant): …
Q31In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?
Q32 Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is $0.15$ ( $g = 10$ m s $^{\dots}$
Q33 A satellite is orbiting just above the surface of the earth with period $T$ . If $d$ is the density of the earth and $G$ is the universal constant of gravitation, the quantity $\dots$
Q34The $x$ - $t$ graph of a particle performing simple harmonic motion is shown in the figure. The acceleration of the particle at $t = 2$ s is:
Q35For the following logic circuit, the truth table is:
Q36 A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity $4$ m s $^{- 1}$ . The ball strikes the water surface after $4 \dots$
Q37 Two thin lenses are of same focal lengths ( $f$ ), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be: …
Q38 A wire carrying a current $I$ along the positive x-axis has length $L$ . It is kept in a magnetic field $\overset{\dots}{B}$
Q39 A bullet from a gun is fired on a rectangular wooden block with velocity $u$ . When bullet travels $24$ cm through the block along its length horizontally, velocity of bullet becomes $3 \dots$
Q40The resistance of platinum wire at $0^{\circ}$ C is $2 Ω$ and $6.8 Ω$ at $8 0^{\circ}$ C. The temperature coefficient of resistance of the wire is:
Q41 An electric dipole is placed as shown in the figure. The electric potential (in $1 0^{2}$ V) at point P due to the dipole is ( $ε_{\dots}$
Q42 $10$ resistors, each of resistance $R$ are connected in series to a battery of emf $E$ and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased $n$ times. The value of $\dots$
Q43 A very long conducting wire is bent in a semi-circular shape from A to B as shown in figure. The magnetic field at point P for steady current configuration is given by: …
Q44The radius of inner most orbit of hydrogen atom is $5.3 \times 1 0^{- 11}$ m. What is the radius of third allowed orbit of hydrogen atom?
Q45The net impedance of circuit (as shown in figure) will be:

NEET 2023

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