The pH of fresh milk is 6. When it turns sour, the pH

• becomes < 6

• remains the same, i.e., 6

• becomes > 6

• becomes neutral, i.e., 7

The displacement of a particle is given by x = cos² ωt. The motion is

• simple harmonic

• periodic but not simple harmonic

• non-periodic

• None of the above

A motor vehicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is

• zero

• towards the centre of the circle

• away from the centre along the radius of the circle

• perpendicular to the radius and along the velocity

An object is undergoing a non-accelerated motion. It's rate of change in momentum is

• a non-zero constant

• zero

• not a constant

• None of the above

5.

The motion of an electron in presence of a magnetic field is depicted in the figure given above. The force acting on the electron will be directed

• into the page

• out of the page

• opposite to the motion of the electron

• along the motion of the electron

Imagine a current-carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is

• clockwise

• anticlockwise

• into the page

• out of the page

Which one among the following hormones stimulates the plant cells to grow in a manner such that the plant appears to be bent towards light?

• Cytokinin

• Auxin

• Gibberellin

• Abscisic acid

Magnetic Resonance Imaging (MRD) is used in medical diagnosis to obtain images of our internal body organs. This is primarily possible because

• our body possesses a permanent magnet

• MRI uses an external magnet to generate a magnetic field in our body

• MRI uses an external electric field to generate magnetic field in our body

• ions motion along our nerve cells generates magnetic fields

The motion of a particle is given by a straight line in the graph given above drawn with displacement (x) and time (t). Which one among the following statements is correct?

• The velocity of the particle is uniform

• The velocity of the particle is non-uniform

• The speed is uniform and the particle is moving on a circular path

• The speed is non-uniform and the particle is moving on a straight line path

The human eye is like a camera and hence it contains a system of lens. The eye lens forms

• a straight or upright, real image of the object on the retina

• an inverted, virtual image of the object on the retina

• an inverted, real image of the object on the retina

• a straight or upright, real image of the object on the iris