3. When a projectile is at the highest point on its trajectory, the potential and kinetic energies are respectively a) maximum and minimum b) minimum and zero c) zero and maximum d) maximum and zero
4. A block of mass 2 kg starts moving when the angle of inclination of the inclined plane is 60o . If the coefficient of kinetic friction is 0.6, the frictional force is a) 2 N b) 1 N c) 4 N d) 0.5 N 5. Two forces F1 = (7i + 2j) N and F2 = (-5i + 3j) N act on a particle. The third force F3 that should act on the particle to make it move with constant velocity is a) (2i + 5j) N b) (-2i – 5j) N c) (–2i + 5j) N d) (2i – 5j) N 6. Two satellites of masses 3M and M orbit the earth in circular orbits of radii r and 3r respectively. The ratio of their speeds is a) 1 : 1 b) : 1 c) 3 : 1 d) 9 : 1 7. In an adiabatic process, the pressure of a gas is proportional to the cube of its absolute temperature. The value of (which equals Cp/Cv) is a) 5/4 b) 4/3 c) 5/3 d) 3/2 Space for rough work AEE15vA 4 8. A mass is moving towards the origin along the x-axis with constant velocity. Its angular momentum with respect to the origin a) remains constant b) is zero c) increases d) decreases 9. The rate of cooling of a liquid is 4o C/s, when its temperature is 80o C and is 2o C/s when its temperature is 50o C. The temperature of the surrounding is a) 30o C b) 20o C c) 10o C d) 25o C 10.A Charged sphere of radius 1m carries a charge of 1 x 10-9 C. The electric fields at a point P, which is at a distance d = 3m from the centre of the sphere and at a point Q, at a distance d = 0.3m from the centre of the sphere are respectively a) 1 N/C and 100 N/C b) 1 N/C and zero c) zero and 1 N/C d) 1 N/C and 3 N/C 11.An electric dipole lying along X-axis with moment 5 Am2 is subjected to an electric field of magnitude 10j N/C. The torque experienced is a) 2 Nm b) 10 Nm c) 50 Nm d) 25 Nm 12.A parallel plate capacitor with air gap of 5 mm is 2 MFD. If a metallic plate of thickness 3 mm is inserted in between the plates, the new capacitance is a) 5 MFD b) 1 MFD c) 2 MFD d) 2.5 MFD 14. Two resistances 6Ω and 3Ω are connected in parallel and this combination is connected in series with a 4Ω resistance. This combination is powered by a voltage source of 12 V and zero internal resistance. The ratio of power dissipated between 6Ω resistance and 4Ω resistance is a) 1:4 b) 4:1 c) 1:8 d) 3:215. Two charged particles of charge ratio 1:4 moving with same velocity enter a region of uniform magnetic field of strength B and get deflected and move along curves with equal radius R. The ratio of their masses is a) 4:1 b) 2:1 c) 1:4 d) 1:2 16. When a charged particle moves in a region with electric field E = 3i N/C and magnetic field B = 5j T, the trajectory of the particle is a) circle b) parabola c) straight line d) helix 17. Two co-axial coils A and B of radius R1 and R2 carry equal amount of current but flowing in opposite direction. The net magnetic field produced at the centre of these coils is zero. The ratio of the current flowing in the coil A to current in coil B is a) R1 : R2 b) R2 : R1 c) (R2 / R1) 2 d) (R1 / R2) 2 20.An object of size 10 cm is kept at a distance of 10 cm from a convex lens. If the focal length of the lens is 5 cm, the size of the image is a) 10 cm b) 20 cm c) 5 cm d) 15 cm 21.A biconvex lens of focal length 10 cm is to be made from a glass material. If the refractive index of the material is 1.5, what must be the radius of curvature of the surface of the lens? a) 0.1 m b) 0.15 m c) 0.20 m d) 0.30m22.A diffraction grating with 106 lines / m is used to determine the wavelength of a monochromatic source. The angle of first order diffraction is 30o . The wavelength of the source is a) 1000 nm b) 500 nm c) 400 nm d) 600 nm 23.A glass plate of thickness 1.5 μm and refractive index 1.5 is introduced between one of the slits and screen in a Young’s double slit experiment. If the wavelength of the monochromatic source used is = 0.75 μm, the phase difference between the interfering waves at the centre of the screen is equal to a) 6 b) 3 c) d) 2 24. What is the velocity of light in a medium with refractive index 1.5? a) 2 x 108 m/s b) 3 x 108 m/s c) 1.5 x 108 m/s d) 2.5 x 108 m/s 25. Which among the following electromagnetic radiations is the most energetic? a) Infra red light b) Visible light c) Ultraviolet light d) microwaves 26. Which of the following particles has the shortest de-Broglie wavelength, if all of them move with same speed? a) beta particle b) alpha particle c) proton d) neutron 27. The mass of a photon of wavelength is given by a) h /c b) /hc c) h/ c d) hc/ 28. The radius of a nucleus with A = 256 is 8 fermi (1 fermi = 1 x 10-15 m). The radius of a nucleus with A = 4 is a) 1 fermi b) 2 fermi c) 3 fermi d) 4 fermi 29. Photons of energy 6 eV fall on the surface of a metal with work function 4 eV. The stopping potential of the metal surface is a) 2 V b) 10 V c) 3 V d) 1 V
3. When a projectile is at the highest point on its trajectory, the potential and kinetic energies are respectively a) maximum and minimum b) minimum and zero c) zero and maximum d) maximum and zero
4. A block of mass 2 kg starts moving when the angle of inclination of the inclined plane is 60o . If the coefficient of kinetic friction is 0.6, the frictional force is a) 2 N b) 1 N c) 4 N d) 0.5 N 5. Two forces F1 = (7i + 2j) N and F2 = (-5i + 3j) N act on a particle. The third force F3 that should act on the particle to make it move with constant velocity is a) (2i + 5j) N b) (-2i – 5j) N c) (–2i + 5j) N d) (2i – 5j) N 6. Two satellites of masses 3M and M orbit the earth in circular orbits of radii r and 3r respectively. The ratio of their speeds is a) 1 : 1 b) : 1 c) 3 : 1 d) 9 : 1 7. In an adiabatic process, the pressure of a gas is proportional to the cube of its absolute temperature. The value of (which equals Cp/Cv) is a) 5/4 b) 4/3 c) 5/3 d) 3/2 Space for rough work AEE15vA 4 8. A mass is moving towards the origin along the x-axis with constant velocity. Its angular momentum with respect to the origin a) remains constant b) is zero c) increases d) decreases 9. The rate of cooling of a liquid is 4o C/s, when its temperature is 80o C and is 2o C/s when its temperature is 50o C. The temperature of the surrounding is a) 30o C b) 20o C c) 10o C d) 25o C 10.A Charged sphere of radius 1m carries a charge of 1 x 10-9 C. The electric fields at a point P, which is at a distance d = 3m from the centre of the sphere and at a point Q, at a distance d = 0.3m from the centre of the sphere are respectively a) 1 N/C and 100 N/C b) 1 N/C and zero c) zero and 1 N/C d) 1 N/C and 3 N/C 11.An electric dipole lying along X-axis with moment 5 Am2 is subjected to an electric field of magnitude 10j N/C. The torque experienced is a) 2 Nm b) 10 Nm c) 50 Nm d) 25 Nm 12.A parallel plate capacitor with air gap of 5 mm is 2 MFD. If a metallic plate of thickness 3 mm is inserted in between the plates, the new capacitance is a) 5 MFD b) 1 MFD c) 2 MFD d) 2.5 MFD 14. Two resistances 6Ω and 3Ω are connected in parallel and this combination is connected in series with a 4Ω resistance. This combination is powered by a voltage source of 12 V and zero internal resistance. The ratio of power dissipated between 6Ω resistance and 4Ω resistance is a) 1:4 b) 4:1 c) 1:8 d) 3:215. Two charged particles of charge ratio 1:4 moving with same velocity enter a region of uniform magnetic field of strength B and get deflected and move along curves with equal radius R. The ratio of their masses is a) 4:1 b) 2:1 c) 1:4 d) 1:2 16. When a charged particle moves in a region with electric field E = 3i N/C and magnetic field B = 5j T, the trajectory of the particle is a) circle b) parabola c) straight line d) helix 17. Two co-axial coils A and B of radius R1 and R2 carry equal amount of current but flowing in opposite direction. The net magnetic field produced at the centre of these coils is zero. The ratio of the current flowing in the coil A to current in coil B is a) R1 : R2 b) R2 : R1 c) (R2 / R1) 2 d) (R1 / R2) 2 20.An object of size 10 cm is kept at a distance of 10 cm from a convex lens. If the focal length of the lens is 5 cm, the size of the image is a) 10 cm b) 20 cm c) 5 cm d) 15 cm 21.A biconvex lens of focal length 10 cm is to be made from a glass material. If the refractive index of the material is 1.5, what must be the radius of curvature of the surface of the lens? a) 0.1 m b) 0.15 m c) 0.20 m d) 0.30m22.A diffraction grating with 106 lines / m is used to determine the wavelength of a monochromatic source. The angle of first order diffraction is 30o . The wavelength of the source is a) 1000 nm b) 500 nm c) 400 nm d) 600 nm 23.A glass plate of thickness 1.5 μm and refractive index 1.5 is introduced between one of the slits and screen in a Young’s double slit experiment. If the wavelength of the monochromatic source used is = 0.75 μm, the phase difference between the interfering waves at the centre of the screen is equal to a) 6 b) 3 c) d) 2 24. What is the velocity of light in a medium with refractive index 1.5? a) 2 x 108 m/s b) 3 x 108 m/s c) 1.5 x 108 m/s d) 2.5 x 108 m/s 25. Which among the following electromagnetic radiations is the most energetic? a) Infra red light b) Visible light c) Ultraviolet light d) microwaves 26. Which of the following particles has the shortest de-Broglie wavelength, if all of them move with same speed? a) beta particle b) alpha particle c) proton d) neutron 27. The mass of a photon of wavelength is given by a) h /c b) /hc c) h/ c d) hc/ 28. The radius of a nucleus with A = 256 is 8 fermi (1 fermi = 1 x 10-15 m). The radius of a nucleus with A = 4 is a) 1 fermi b) 2 fermi c) 3 fermi d) 4 fermi 29. Photons of energy 6 eV fall on the surface of a metal with work function 4 eV. The stopping potential of the metal surface is a) 2 V b) 10 V c) 3 V d) 1 V
Ask one question at a time. This is inappropriate. Dont repeat this.
I will answer the first question.
At highest point the velocity become zero
And we know that
Kinetic energy=1/2 mv^2
At highest point v=0
There for kinetic enrgy=0
And potential energy become maximum
I will answer the first question.
At highest point the velocity become zero
And we know that
Kinetic energy=1/2 mv^2
At highest point v=0
There for kinetic enrgy=0
And potential energy become maximum
