NEET WEEKLY TEST PHYSICS (09.08.2025)

2. If the component of a quantity along the horizontal is greater than the component along vertical, then which of the following is true?

3. At t=0, the velocity of a particle is Due to some force the acceleration becomes .The final speed of the particle in m/s at time  will be

1. 14
2. 9
3. 13
4. 10

4. If the position vector of a particle in XY plane is given by . The position of the particle in m on the vertical axis at time t=2 s is

1. 36 m
2. -36 m
3. 10 m
4. -10 m

5. If the horizontal range is equal to the maximum height attained, the angle of projection for a projectile fired at an angle to the horizontal is

6. If a particle is moving under uniform circular motion, which of the following is true

1. The angular acceleration of the particle is unity
2. The linear velocity is constant
3. The centripetal acceleration is zero
4. The tangential acceleration is zero

7. The horizontal velocity (u) of projection of an object fired parallel to the horizontal having its path y=x² is given by

8. For a particle moving in uniform circular motion, the angle between the radial acceleration and the linear velocity is

1. 90º
2. 180º
3. 60º
4. 360º

9. A B-2 Bomber flying horizontally with a speed 280 m/s drops a gravity bomb of mass 50 kg. Neglecting air resistance, calculate the distance from the ground such that the bomb strikes the target on the ground if the Bomber flies 2.5 km above the ground. (Use g=10 ms^-2;take √5=2.23 )

1. 6250 m
2. 5244 m
3. 5250 m
4. 6244 m

10. A bullet of mass 0.24 kg is fired at angle with the horizontal with an initial velocity of  . The kinetic energy of the bullet at the highest point of its motion is

1. 0 J
2. 27 J
3. 30 J
4. 10 J

11. Grace can swim with a speed of 2 m/s in still water. Suppose she wished to cross a river that is flowing with a speed of 1 m/s due west. If she is at the north bank of the river, at what angle does she have to make with the north direction so that she lands exactly to her starting point on the opposite bank?

1. 30º west
2. 30º east
3. 60º east
4. 60º west

12. Choose the correct set of equations for a projectile fired at an angle to the X-axis

13. For a particle moving in a uniform circular motion, the scalar product between the angular velocity and the linear velocity vector is

14. For a ball projected vertically upwards, its potential energy at the highest point is

1. maximum
2. minimum
3. equal to its K.E. at the highest po
4. equal to half of its K.E. at the highest point

15. If the angular speed of the Earth around the Sun in a circular orbit is 1.99×10^-7 rad s^-1, then the linear speed of the Earth around the Sun if the distance between them is 150×10⁹ m is?

1. 28.95 km/s
2. 29.85 km/s
3. 28.85 km/s   
4. 29.95 km/s

16. A constant torque of 1000Nm turns a wheel of moment of inertia 200kgm²about an axis through its centre. Its angular velocity after 3 seconds is.

1. 1rad/s
2. 5rad/s
3. 10rad/s
4. 15rad/s

17. The angular velocity of second hand of a clock will be.

18. When a mass is rotating in a plane about a fixed point, the direction of angular momentum is along.

1. A line perpendicular to the plane of rotation
2. The tangent to the orbit
3. The line making an angle of 45∘to the plane of rotation
4. The radius

19. A disc and a solid sphere of same radius but different masses roll off on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first?

1. Disk
2. Sphere
3. Both reach at the same time
4. Depends on their masses

20. The centre of mass of a body

1. lies always at the geometrical centre
2. lies always inside the body
3. lies always outside the body
4. may lie within or outside the body

21. Moment of inertia of body depends upon

1. mass of the body
2. axis of rotation of the body
3. shape and size of the body
4. all of these

22. A body having its centre of mass at the origin has three of its particles at (a,0,0), (0, a,0), (0,0, a). The moments of inertia of the body about the X and Y axes are 0.20 kg m² The moment of inertia about the Z-axis

1. 20 kgm²
2. 40 kgm²
3. 20√2 kgm²
4. cannot be deduced with this information.

23. Two particles of equal mass have velocities v₁=2i ms⁻¹and v₂=2j ms⁻¹ First particle has an acceleration a=(3i+3j) ms⁻² while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a path of

1. Straight line
2. Parabola
3. Circle
4. Ellipse

24. A solid cylinder of mass 20kg and radius 20cm rotates about its axis with an angular speed 100rads⁻¹. The angular momentum of the cylinder about its axis is

1. 40 J s
2. 400 J s
3. 20 J s
4. 200 J s

25. A force   acts at a point (2, -3, 1). Then magnitude of torque about point (0,0,2) will be

1. 6 units
2. 3√5 units
3. 6√5 units
4. None of these

26. A rigid body can be hinged about any point on the x-axis. When it is hinged such that the hinge is at x, the moment of inertia is given by I=2x²−12x+27. The x-coordinate of centre of mass is.

1. x=2
2. x=0
3. x=1
4. x=3

27. For which of the following does the centre of mass lie outside the body?

1. A pencil
2. A shotput
3. A dice
4. A ring

28. The radius of gyration of a solid sphere of radius r about a certain axis is r. The distance of this axis from the centre of the sphere is

1. r
2. 0.5 r
3. √0.6 r
4. √0.5 r

29. A body A of mass M while falling vertically downwards under gravity brakes into two parts, a body B of mass 1/3M and a body C of mass 2/3 The center of mass of bodies B and C taken together shifts compared to that of body A towards

1. depends on the height of breaking
2. does not shift
3. body C
4. body B

30. The correct relation between linear velocity  and angular velocity   of a particle is

31. If λ₁ and λ₂ are the wavelength of the first line of the Lyman and Paschen series respectively, then λ₁:λ₂ is

1. 1:3
2. 1:30
3. 7:50
4. 7:108

32. In the following nuclear reaction,

What does X stand for?

1. A proton
2. A neutron
3. A neutrino
4. An electron

33. Which of the following nuclear reaction is not possible.

34. Taking the Bohr radius as a₀=53 pm, the radius of Li⁺⁺ ion in its ground state, on the basis of Bohr’s model, will be about

1) 53 pm
2) 159 pm
3) 18 pm
4) 13 pm

35. The number of de Broglie wavelengths contained in the second Bohr orbit of Hydrogen atom is

1. One
2. Two
3. Three
4. Four

36. What is the approximate ratio of volume of a nucleus to the volume of an atom?

1. 10-³⁴
2. 10^-15
3. 10^-5
4. 10^-10

37. A force between two protons is same as the force between two neutrons. The nature of the force is

1. Electrostatic force
2. Gravitational force
3. Magnetic force
4. Nuclear force

38. The mass of ₃Li⁷ nucleus is 0.042 amu less than the sum of masses of its constituent nucleons. The binding energy per nucleon is

1. 5.589 MeV
2. 10.522 MeV
3. 2.433 MeV
4. 39.123 MeV

39. How much mass has to be converted into energy to produce electric power of for one hour?

1. 2 kg
2. 40 mg
3. 4 kg
4. 20 mg

40. If the nucleus of    has a nuclear radius of about 3.6 fm, then  would have its radius approximately

1. 2.16 fm
2. 12 fm
3. 4.8 fm
4. 6 fm

41. Angular momentum of an electron in hydrogen atom is . The kinetic energy of the electron in that orbit is

1. 3.4 eV
2. 13.6 eV
3. 1.5 eV
4. 6.8 eV

42. One of the lines in the emission of Li²⁺ has the same wavelength as that of the second line of Balmer series in Hydrogen spectrum. The electronic transition corresponding to this line is

43. The mass of an α-particle is

1. equal to the mass of four protons
2. equal to the mass of four neutrons
3. equal to the sum of masses of two protons and two neutrons
4. less than the sum of masses of two protons and two neutrons

44. Which of the following electronic transitions in hydrogen atom gives out highest energy photon?

45. The number of spectral lines that will be observed with our naked eye when electrons in 5^th excited state in different hydrogen atoms returns to its ground state.

1. 15
2. 4
3. 5
4. 10