50278 + Interview Questions in Physics Page 47 InterviewSolution

2301.	A rigid beam is hinged at one end and supported on linear elasitc spring (both having a stiffness of 'k') at points '1' and'2', and an inclined load acts at '2', as shown in figurewhich of the following option represents the deflection δ1andδ2 at points 1 and 2?
Answer» A rigid beam is hinged at one end and supported on linear elasitc spring (both having a stiffness of 'k') at points '1' and'2', and an inclined load acts at '2', as shown in figure which of the following option represents the deflection $δ_{1} a n d δ_{2}$ at points 1 and 2?

Discussion

2302.	7.A conducting rod MN of length 2l moves through a uniform magnetic field of induction B, acting into the plane of the paper. The rod makes an angle theta with the vertical while it falls with a uniform linear velocity v. The potential difference between the two ends of the rod equals (a)Zero (b)2Bvlsintheta (d)2Bvl (d)None of these
Answer» 7.A conducting rod MN of length 2l moves through a uniform magnetic field of induction B, acting into the plane of the paper. The rod makes an angle theta with the vertical while it falls with a uniform linear velocity v. The potential difference between the two ends of the rod equals (a)Zero (b)2Bvlsintheta (d)2Bvl (d)None of these

Discussion

2303.	The amplifiers A, B and C are connected in series. If the voltage gain of A, B and C are 10, 15 and 20 respectively and input signal 2 mV peak value. Then the output signal voltage’s peak value will be (1) 6 V(2) 5 V(3) 3 V (4) 4 V
Answer» The amplifiers A, B and C are connected in series. If the voltage gain of A, B and C are 10, 15 and 20 respectively and input signal 2 mV peak value. Then the output signal voltage’s peak value will be (1) 6 V(2) 5 V(3) 3 V (4) 4 V

Discussion

2304.	A resistor of 16 Ω is cut into 4 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is
Answer» A resistor of $16 Ω$ is cut into 4 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is

2304.

A resistor of 16 Ω is cut into 4 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is

Answer»

A resistor of $16 Ω$ is cut into 4 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is

Discussion

2305.	Consider a charged particle of mass m and charge q released from the origin in a region of magnetic field, →B=B0^j and electric field →E=E0^k . The speed of the particle as a function of its z−coordinate will be (Neglect gravity)
Answer» Consider a charged particle of mass $m$ and charge $q$ released from the origin in a region of magnetic field, $\to B = B_{0}^j$ and electric field $\to E = E_{0}^k$ . The speed of the particle as a function of its $z -$ coordinate will be (Neglect gravity)

Discussion

2306.	Explain hybridisation in detail and how to calculate for particular ion atom etc
Answer» Explain hybridisation in detail and how to calculate for particular ion atom etc

Discussion

2307.	Two particles A and B move with constant velocities v1 and v2 .at the initial moment their position vectors are r1 and r2 respectively. The condition for particles A and B for their collision.
Answer» Two particles A and B move with constant velocities v1 and v2 .at the initial moment their position vectors are r1 and r2 respectively. The condition for particles A and B for their collision.

Discussion

2308.	A gas expands 0.25m3 at constant pressure 103N/m2, the work done is
Answer» A gas expands $0.25 m^{3}$ at constant pressure $10^{3} N / m^{2}$ , the work done is

Discussion

2309.	Determine the magnitude of the resultant amplitude for the interference of two similar waves when the phase difference between them is 45∘. Given that, amplitudes of both sources are A1=3 cm, A2=4 cm.
Answer» Determine the magnitude of the resultant amplitude for the interference of two similar waves when the phase difference between them is $45^{\circ}$ . Given that, amplitudes of both sources are $A_{1} = 3 cm, A_{2} = 4 cm$ .

Discussion

2310.	When an object is stationary but the point of application of force moves on the object, work done is
Answer» When an object is stationary but the point of application of force moves on the object, work done is

Discussion

2311.	a concave lens forms the image of an object such that the distance between the object and image is 10cm and the magnification produced is 1/4 . the focal lens of the lens will be
Answer» a concave lens forms the image of an object such that the distance between the object and image is 10cm and the magnification produced is 1/4 . the focal lens of the lens will be

Discussion

2312.	The distance between two particles is decreasing at the rate of 6msec. If these particles travel with same speeds as in previous case and in the same direction, then the separation increase at the rate of 4msec. The particles have speeds as
Answer» The distance between two particles is decreasing at the rate of $6 \frac{m}{s e c}$ . If these particles travel with same speeds as in previous case and in the same direction, then the separation increase at the rate of $4 \frac{m}{s e c}$ . The particles have speeds as

Discussion

2313.	If a bar magnet of pole strength m and magnetic moment M is cut into 5 equal parts parallel to its axis and 4 parts equally perpendicular to its axis, then the pole strength and magnetic moment of each piece are respectively
Answer» If a bar magnet of pole strength $m$ and magnetic moment $M$ is cut into $5$ equal parts parallel to its axis and $4$ parts equally perpendicular to its axis, then the pole strength and magnetic moment of each piece are respectively

Discussion

2314.	A stiff metal rod of mass 13 kg is kept over two knife edges of length L=1 m with a gap of d=10 cm between them as shown in the figure.The rod carries a current of 16 A (in the direction shown) and rolls along the rails without slipping due to the magnetic force produced by a uniform magnetic field of 0.5 T perpendicular and pointing downwards. If the rod starts from rest and its speed when it leaves the rails is k√5 ms−1, then the value of k (integer) is
Answer» A stiff metal rod of mass $\frac{1}{3} k g$ is kept over two knife edges of length $L = 1 m$ with a gap of $d = 10 c m$ between them as shown in the figure. The rod carries a current of $16 A$ (in the direction shown) and rolls along the rails without slipping due to the magnetic force produced by a uniform magnetic field of $0.5 T$ perpendicular and pointing downwards. If the rod starts from rest and its speed when it leaves the rails is $\frac{k}{\sqrt{5}} m s^{- 1}$ , then the value of k (integer) is

Discussion

2315.	Four particles of mass 5, 3, 2 and 4 kg are at the points (1,6), (-1,5), (2,-3) and (-1,-4) respectively. Find the coordinate of their centre of mass.
Answer» Four particles of mass 5, 3, 2 and 4 kg are at the points (1,6), (-1,5), (2,-3) and (-1,-4) respectively. Find the coordinate of their centre of mass.

Discussion

2316.	A spaceman in training is rotated in a seat at the end of a horizontal arm of length 5 m. if he can withstand acceleration upto 9g,then what is the maximum number of revouloution per sec permissible?
Answer» A spaceman in training is rotated in a seat at the end of a horizontal arm of length 5 m. if he can withstand acceleration upto 9g,then what is the maximum number of revouloution per sec permissible?

Discussion

2317.	In the given figure, a mass M is attached to a horizontal spring, which is fixed on one side to a rigid support. The spring constant of the spring is k. The mass oscillates on a frictionless surface with time period T and amplitude A. When the mass is in equilibrium position, as shown in the figure, another mass m is gently fixed upon it then the new amplitude of oscillation will be :
Answer» In the given figure, a mass $M$ is attached to a horizontal spring, which is fixed on one side to a rigid support. The spring constant of the spring is $k$ . The mass oscillates on a frictionless surface with time period $T$ and amplitude $A$ . When the mass is in equilibrium position, as shown in the figure, another mass $m$ is gently fixed upon it then the new amplitude of oscillation will be :

Discussion

2318.	Two equally charged, identical metal spheres A and B repel each other with a force 'F. The spheres are kept fixed with a distance 'r' between them. A third identical, but unchargedsphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is(a) F(c) F/2(b) 3F/4(d) F/4
Answer» Two equally charged, identical metal spheres A and B repel each other with a force 'F. The spheres are kept fixed with a distance 'r' between them. A third identical, but unchargedsphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is(a) F(c) F/2(b) 3F/4(d) F/4

Discussion

2319.	One mole of an ideal gas (γ=1.4) is adiabatically compressed so that its temperature rises from 27oC to 35oC. The change in the internal energy of the gas is (given R = 80. J / mole / K)
Answer» One mole of an ideal gas $(γ = 1.4)$ is adiabatically compressed so that its temperature rises from $27^{o} C t o 35^{o} C$ . The change in the internal energy of the gas is (given R = 80. J / mole / K)

Discussion

2320.	A swimmer can swim in still water with speed v and the river flowing with velocity v2. To cross the river in shortest distance, he should swim making an angle θ with the upstream. What is the ratio of the time taken to swim across in the shortest time to that in swimming across over shortest distance ?
Answer» A swimmer can swim in still water with speed $v$ and the river flowing with velocity $\frac{v}{2}$ . To cross the river in shortest distance, he should swim making an angle $θ$ with the upstream. What is the ratio of the time taken to swim across in the shortest time to that in swimming across over shortest distance ?

Discussion

2321.	A body is projected vertically upward from ground . Taking vertical upward direction as positive and point of projection as origin. The sign of displacement of body from the origin when it is at height h during upward and downward journey will be(1)Positive,positive (2)Positive,negative(3)Negative,negative (4)Negative,positive
Answer» A body is projected vertically upward from ground . Taking vertical upward direction as positive and point of projection as origin. The sign of displacement of body from the origin when it is at height h during upward and downward journey will be (1)Positive,positive (2)Positive,negative (3)Negative,negative (4)Negative,positive

2321.

A body is projected vertically upward from ground . Taking vertical upward direction as positive and point of projection as origin. The sign of displacement of body from the origin when it is at height h during upward and downward journey will be(1)Positive,positive (2)Positive,negative(3)Negative,negative (4)Negative,positive

Answer»

A body is projected vertically upward from ground . Taking vertical upward direction as positive and point of projection as origin. The sign of displacement of body from the origin when it is at height h during upward and downward journey will be

(1)Positive,positive

(2)Positive,negative

(3)Negative,negative

(4)Negative,positive

Discussion

2322.	In the circuit shown in figure, the rms current I1, I2 & I3 , are altered by varying frequency f of the oscillator. The output voltage of the oscillator remains sinusoidal and has a fixed amplitude. Which curves in figure correctly indicate the variation with frequency of currents I1, I2 & I3?
Answer» In the circuit shown in figure, the rms current $I_{1}, I_{2} & I_{3}$ , are altered by varying frequency $f$ of the oscillator. The output voltage of the oscillator remains sinusoidal and has a fixed amplitude. Which curves in figure correctly indicate the variation with frequency of currents $I_{1}, I_{2} & I_{3}$ ?

Discussion

2323.	Three blocks 1, 2 and 3 are arranged as shown in the figure. The velocities of the blocks v1, v2 and v3 are shown in the figure. What is the relationship between v1, v2 and v3?
Answer» Three blocks 1, 2 and 3 are arranged as shown in the figure. The velocities of the blocks $v_{1}, v_{2}$ and $v_{3}$ are shown in the figure. What is the relationship between $v_{1}, v_{2}$ and $v_{3}$ ?

Discussion

2324.	7.) A bullet when fired at a target with a velocity of 50m/s penetrates 0.5m into it If bullet is fired at a similar target with thickness 0.25m then it will emerge from target with a velocity of
Answer» 7.) A bullet when fired at a target with a velocity of 50m/s penetrates 0.5m into it If bullet is fired at a similar target with thickness 0.25m then it will emerge from target with a velocity of

Discussion

2325.	Select the species of highest electronegativityOptions::NaNa3+Na2+Na+
Answer» Select the species of highest electronegativity Options:: Na Na3+ Na2+ Na+

Discussion

2326.	51. A body cools from 50^° C to 40^° C in10 minutes. How long will it take to cool from 40^° C to 30^° C. Of temperature of surrounding to be 30^° C? 1) 10 minutes 2) 12 minutes 3) 15 minutes 4) infinite time
Answer» 51. A body cools from 50^° C to 40^° C in10 minutes. How long will it take to cool from 40^° C to 30^° C. Of temperature of surrounding to be 30^° C? 1) 10 minutes 2) 12 minutes 3) 15 minutes 4) infinite time

Discussion

2327.	For the situation shown in figure, match the following table. Table -1Table -2(A)Absolute acceleration of(P) 11 m/s21 kg block(B)Absolute acceleration of(Q) 6 m/s22 kg block(C)Relative acceleration between(R) 17 m/s2the two blocks(S) None
Answer» For the situation shown in figure, match the following table. $\begin{matrix} Table -1 & Table -2 (A)Absolute acceleration of & (P) 11 {m/s}^{2} 1 kg block (B)Absolute acceleration of & (Q) 6 {m/s}^{2} 2 kg block (C)Relative acceleration between & (R) 17 {m/s}^{2} the two blocks (S) None \end{matrix}$

Discussion

2328.	The capacity of a parallel plate capacitor is 10 μF. This capacitor is divided into two equal parts and these parts are filled by media of dielectric constant 2 and 4. The new capacitance will be
Answer» The capacity of a parallel plate capacitor is $10 μ F$ . This capacitor is divided into two equal parts and these parts are filled by media of dielectric constant $2$ and $4$ . The new capacitance will be

Discussion

2329.	Consider a car of mass 1000 kg moving with a speed of 36 km/h on a smooth road and colliding with a horizontally mounted spring of spring constant 10 KNm−1. Find the maximum compression of the spring.
Answer» Consider a car of mass $1000 kg$ moving with a speed of $36 km/h$ on a smooth road and colliding with a horizontally mounted spring of spring constant $10 {KNm}^{- 1}$ . Find the maximum compression of the spring.

Discussion

2330.	A steel rod 100 cm long is clamped at its middle. The fundamental frequency of longitudinal vibrations of the rod is given to be 2.53 kHz. What is the speed of sound in steel?
Answer» A steel rod 100 cm long is clamped at its middle. The fundamental frequency of longitudinal vibrations of the rod is given to be 2.53 kHz. What is the speed of sound in steel?

Discussion

2331.	A ball with a speed of 9 m/s collides with another identical ball at rest. After the collision, the direction of each ball makes an angle of 30∘ with the original direction. The ratio of velocities of the balls after collision is x:y, where x is
Answer» A ball with a speed of $9 m/s$ collides with another identical ball at rest. After the collision, the direction of each ball makes an angle of $30^{\circ}$ with the original direction. The ratio of velocities of the balls after collision is $x : y$ , where $x$ is

Discussion

2332.	Question 6Ayush starts walking from his house to office. Instead of going to the office directly, he goes to a bank first, from there to his daughter’s school and then reaches the office. What is the extra distance travelled by Ayush in reaching his office? (Assume that all distance covered are straight lines). If the house is situated at (2,4), bank at(5,8), school at (13,14) and office at (13,26) and coordinates are in km.
Answer» Question 6 Ayush starts walking from his house to office. Instead of going to the office directly, he goes to a bank first, from there to his daughter’s school and then reaches the office. What is the extra distance travelled by Ayush in reaching his office? (Assume that all distance covered are straight lines). If the house is situated at (2,4), bank at(5,8), school at (13,14) and office at (13,26) and coordinates are in km.

Discussion

2333.	A piezoelectric transducer with a sensitivity of 2.0 pC/N having a capacitance of 1200 pF and leakage resistance of 1012Ω is connected to a charge amplifier as shown in the figure. If a force of 0.5 sin 10t N is applied to the transducer, the output amplitude of the charge amplifier is ____.
Answer» A piezoelectric transducer with a sensitivity of $2.0 p C / N$ having a capacitance of $1200 p F$ and leakage resistance of $10^{12} Ω$ is connected to a charge amplifier as shown in the figure. If a force of $0.5 s i n 10 t N$ is applied to the transducer, the output amplitude of the charge amplifier is ____.

Discussion

2334.	the potential distance between the ends of a resistance R is VR between the ends of capacitor is VC=2VR and between the ends of inductance is VL=3VR, then the alternating potential of the source in terms of VR will be -
Answer» the potential distance between the ends of a resistance R is VR between the ends of capacitor is VC=2VR and between the ends of inductance is VL=3VR, then the alternating potential of the source in terms of VR will be -

Discussion

2335.	A block of mass m=2 kg is placed on an inclined smooth surface of inclination θ=60∘. One end of a massless spring of relaxed length 50 cm and spring constant k is fixed on top of a plane. A block is attached with another end of spring extends by 2.5 cm. The mass is displaced slightly and released, the time period of resulting oscillation will be,
Answer» A block of mass $m = 2 kg$ is placed on an inclined smooth surface of inclination $θ = 60^{\circ}$ . One end of a massless spring of relaxed length $50 cm$ and spring constant $k$ is fixed on top of a plane. A block is attached with another end of spring extends by $2.5 cm$ . The mass is displaced slightly and released, the time period of resulting oscillation will be,

Discussion

2336.	An insulated sphere of radius r has charge density p . The electric field at a distance r from the centre of sphere[r
Answer» An insulated sphere of radius r has charge density p . The electric field at a distance r from the centre of sphere[r

Discussion

2337.	A metal with work function of 3.7 eV is being used in a photoelectric experiment. A light source is switched on and light is allowed to fall on the plate such that it delivers 10 eV to each electron. Find the kinetic energy with which the electrons will come out?
Answer» A metal with work function of 3.7 eV is being used in a photoelectric experiment. A light source is switched on and light is allowed to fall on the plate such that it delivers 10 eV to each electron. Find the kinetic energy with which the electrons will come out?

Discussion

2338.	How many significant figures are present in 257 cm?
Answer» How many significant figures are present in 257 cm?

Discussion

2339.	A smooth block of mass m is placed on a smooth plank of mass M. The acceleration of M when it is acted by a force F is? Also find acceleration of m?
Answer» A smooth block of mass m is placed on a smooth plank of mass M. The acceleration of M when it is acted by a force F is? Also find acceleration of m?

2339.

A smooth block of mass m is placed on a smooth plank of mass M. The acceleration of M when it is acted by a force F is? Also find acceleration of m?

Answer»

A smooth block of mass m is placed on a smooth plank of mass M. The acceleration of M when it is acted by a force F is? Also find acceleration of m?

Discussion

2340.	In derivation of mirror formula, we take distance as negative. Why we take the distance as negative opposite to the direction of incident light ? We can also also take the distance in the direction of incident light or not according to our choice or not?
Answer» In derivation of mirror formula, we take distance as negative. Why we take the distance as negative opposite to the direction of incident light ? We can also also take the distance in the direction of incident light or not according to our choice or not?

Discussion

2341.	Why h bond is a weak bond
Answer» Why h bond is a weak bond

Discussion

2342.	In an unbiased p-n junction, holes diffuse from the p-region to n-region because(a) free electrons in the n-region attract them.(b) they move across the junction by the potential difference.(c) hole concentration in p-region is more as compared to n-region.(d) All the above.
Answer» In an unbiased p-n junction, holes diffuse from the p-region to n-region because (a) free electrons in the n-region attract them. (b) they move across the junction by the potential difference. (c) hole concentration in p-region is more as compared to n-region. (d) All the above.

2342.

In an unbiased p-n junction, holes diffuse from the p-region to n-region because(a) free electrons in the n-region attract them.(b) they move across the junction by the potential difference.(c) hole concentration in p-region is more as compared to n-region.(d) All the above.

Answer»

In an unbiased p-n junction, holes diffuse from the p-region to n-region because

(a) free electrons in the n-region attract them.

(b) they move across the junction by the potential difference.

(c) hole concentration in p-region is more as compared to n-region.

(d) All the above.

Discussion

2343.	A particle executing SHM then Ratio of average acceleration (from extreme to mean position) and maximum acceleration?
Answer» A particle executing SHM then Ratio of average acceleration (from extreme to mean position) and maximum acceleration?

Discussion

2344.	A body has travelled first half of the journey with two different time intervals in the ratio 2:1 with constant speed V1 and V2 and remaining half of the total journey with constant speed V3.Find Average speed of the body
Answer» A body has travelled first half of the journey with two different time intervals in the ratio 2:1 with constant speed V1 and V2 and remaining half of the total journey with constant speed V3.Find Average speed of the body

Discussion

2345.	The main scale reading of a vernier calliper is obtained as 3.2 cm for an object placed in it. If the 4th division of the vernier scale coincides with a division on the main scale, and the magnitude of the positive zero error is 0.03 cm, what is the true length of the object in cm? Take L.C. = 0.01 cm.
Answer» The main scale reading of a vernier calliper is obtained as 3.2 cm for an object placed in it. If the 4th division of the vernier scale coincides with a division on the main scale, and the magnitude of the positive zero error is 0.03 cm, what is the true length of the object in cm? Take L.C. = 0.01 cm.

Discussion

2346.	15.How to know about the direction of magnetic field
Answer» 15.How to know about the direction of magnetic field

Discussion

2347.	In the figure shown, the block of mass m isgiven a speed U, up an inclined plane (with-0.5). Its speed when it reaches the top ofinclined plane is
Answer» In the figure shown, the block of mass m isgiven a speed U, up an inclined plane (with-0.5). Its speed when it reaches the top ofinclined plane is

Discussion

2348.	A cannon fires two shells successively in the same plane with velocity u, the first shell at an angle of alpha to the horizontal and the second shell at an angle of beta to the horizontal, if the two shells collide with each other during their flights, obtain an expression for the time interval between the firings of the shells
Answer» A cannon fires two shells successively in the same plane with velocity u, the first shell at an angle of alpha to the horizontal and the second shell at an angle of beta to the horizontal, if the two shells collide with each other during their flights, obtain an expression for the time interval between the firings of the shells

Discussion

2349.	In the ideal double slit experiment, when a glass plate (μ=1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength λ), the intensity at the position where central maxima occurred previously remains unchanged. The minimum thickness of glass plate is kλ, then the value of k is (Integer only)
Answer» In the ideal double slit experiment, when a glass plate $(μ = 1.5$ ) of thickness $t$ is introduced in the path of one of the interfering beams (wavelength $λ$ ), the intensity at the position where central maxima occurred previously remains unchanged. The minimum thickness of glass plate is $k λ$ , then the value of $k$ is (Integer only)

Discussion

2350.	Find the current in a copper wire having cross-sectional area 2 mm2. Given that Electric field E=8.5×10−3 Vm−1 and resistivity ρ=1.7×10−8 Ω m[1 Mark]
Answer» Find the current in a copper wire having cross-sectional area $2 {mm}^{2}$ . Given that Electric field $E = 8.5 \times 10^{- 3} V m^{- 1}$ and resistivity $ρ = 1.7 \times 10^{- 8} Ω m$ $[$ 1 Mark $]$

Discussion

Explore topic-wise InterviewSolutions in .

A rigid beam is hinged at one end and supported on linear elasitc spring (both having a stiffness of 'k') at points '1' and'2', and an inclined load acts at '2', as shown in figurewhich of the following option represents the deflection δ1andδ2 at points 1 and 2?

The amplifiers A, B and C are connected in series. If the voltage gain of A, B and C are 10, 15 and 20 respectively and input signal 2 mV peak value. Then the output signal voltage’s peak value will be (1) 6 V(2) 5 V(3) 3 V (4) 4 V

A resistor of 16 Ω is cut into 4 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is

Consider a charged particle of mass m and charge q released from the origin in a region of magnetic field, →B=B0^j and electric field →E=E0^k . The speed of the particle as a function of its z−coordinate will be (Neglect gravity)

Explain hybridisation in detail and how to calculate for particular ion atom etc

Two particles A and B move with constant velocities v1 and v2 .at the initial moment their position vectors are r1 and r2 respectively. The condition for particles A and B for their collision.

A gas expands 0.25m3 at constant pressure 103N/m2, the work done is

Determine the magnitude of the resultant amplitude for the interference of two similar waves when the phase difference between them is 45∘. Given that, amplitudes of both sources are A1=3 cm, A2=4 cm.

When an object is stationary but the point of application of force moves on the object, work done is

a concave lens forms the image of an object such that the distance between the object and image is 10cm and the magnification produced is 1/4 . the focal lens of the lens will be

The distance between two particles is decreasing at the rate of 6msec. If these particles travel with same speeds as in previous case and in the same direction, then the separation increase at the rate of 4msec. The particles have speeds as

If a bar magnet of pole strength m and magnetic moment M is cut into 5 equal parts parallel to its axis and 4 parts equally perpendicular to its axis, then the pole strength and magnetic moment of each piece are respectively

Four particles of mass 5, 3, 2 and 4 kg are at the points (1,6), (-1,5), (2,-3) and (-1,-4) respectively. Find the coordinate of their centre of mass.

A spaceman in training is rotated in a seat at the end of a horizontal arm of length 5 m. if he can withstand acceleration upto 9g,then what is the maximum number of revouloution per sec permissible?

One mole of an ideal gas (γ=1.4) is adiabatically compressed so that its temperature rises from 27oC to 35oC. The change in the internal energy of the gas is (given R = 80. J / mole / K)

Three blocks 1, 2 and 3 are arranged as shown in the figure. The velocities of the blocks v1, v2 and v3 are shown in the figure. What is the relationship between v1, v2 and v3?

7.) A bullet when fired at a target with a velocity of 50m/s penetrates 0.5m into it If bullet is fired at a similar target with thickness 0.25m then it will emerge from target with a velocity of

Select the species of highest electronegativityOptions::NaNa3+Na2+Na+

51. A body cools from 50^° C to 40^° C in10 minutes. How long will it take to cool from 40^° C to 30^° C. Of temperature of surrounding to be 30^° C? 1) 10 minutes 2) 12 minutes 3) 15 minutes 4) infinite time

For the situation shown in figure, match the following table. Table -1Table -2(A)Absolute acceleration of(P) 11 m/s21 kg block(B)Absolute acceleration of(Q) 6 m/s22 kg block(C)Relative acceleration between(R) 17 m/s2the two blocks(S) None

The capacity of a parallel plate capacitor is 10 μF. This capacitor is divided into two equal parts and these parts are filled by media of dielectric constant 2 and 4. The new capacitance will be

Consider a car of mass 1000 kg moving with a speed of 36 km/h on a smooth road and colliding with a horizontally mounted spring of spring constant 10 KNm−1. Find the maximum compression of the spring.

A steel rod 100 cm long is clamped at its middle. The fundamental frequency of longitudinal vibrations of the rod is given to be 2.53 kHz. What is the speed of sound in steel?

A ball with a speed of 9 m/s collides with another identical ball at rest. After the collision, the direction of each ball makes an angle of 30∘ with the original direction. The ratio of velocities of the balls after collision is x:y, where x is

A piezoelectric transducer with a sensitivity of 2.0 pC/N having a capacitance of 1200 pF and leakage resistance of 1012Ω is connected to a charge amplifier as shown in the figure. If a force of 0.5 sin 10t N is applied to the transducer, the output amplitude of the charge amplifier is ____.

the potential distance between the ends of a resistance R is VR between the ends of capacitor is VC=2VR and between the ends of inductance is VL=3VR, then the alternating potential of the source in terms of VR will be -

An insulated sphere of radius r has charge density p . The electric field at a distance r from the centre of sphere[r

A metal with work function of 3.7 eV is being used in a photoelectric experiment. A light source is switched on and light is allowed to fall on the plate such that it delivers 10 eV to each electron. Find the kinetic energy with which the electrons will come out?

How many significant figures are present in 257 cm?

A smooth block of mass m is placed on a smooth plank of mass M. The acceleration of M when it is acted by a force F is? Also find acceleration of m?

In derivation of mirror formula, we take distance as negative. Why we take the distance as negative opposite to the direction of incident light ? We can also also take the distance in the direction of incident light or not according to our choice or not?

Why h bond is a weak bond

In an unbiased p-n junction, holes diffuse from the p-region to n-region because(a) free electrons in the n-region attract them.(b) they move across the junction by the potential difference.(c) hole concentration in p-region is more as compared to n-region.(d) All the above.

A particle executing SHM then Ratio of average acceleration (from extreme to mean position) and maximum acceleration?

A body has travelled first half of the journey with two different time intervals in the ratio 2:1 with constant speed V1 and V2 and remaining half of the total journey with constant speed V3.Find Average speed of the body

15.How to know about the direction of magnetic field

In the figure shown, the block of mass m isgiven a speed U, up an inclined plane (with-0.5). Its speed when it reaches the top ofinclined plane is

Find the current in a copper wire having cross-sectional area 2 mm2. Given that Electric field E=8.5×10−3 Vm−1 and resistivity ρ=1.7×10−8 Ω m​​​​​​​[1 Mark]

Find the current in a copper wire having cross-sectional area 2 mm2. Given that Electric field E=8.5×10−3 Vm−1 and resistivity ρ=1.7×10−8 Ω m[1 Mark]