Complete the following by choosing the correct answers from the bracket:

(a) In uniform circular motion the centrifugal force acts …………… [towards the centre/away from the centre/along the tangential direction].

(b) Refractive index of a medium is independent of …………… [temperature/angle of incidence/wavelength of light].

(c) Heat absorbed during change of phase depends on …………… [mass/change in temperature/specific heat capacity] of the substance.

(d) Emf of a cell is …………… [greater than/less than/equal to] the terminal voltage when the cell is in open circuit.

(e) In a step-up transformer the turns ratio is …………… [more than 1/less than 1/equal to 1].

(f) The nuclear radiation with lowest ionising power is …………… [α/β/γ].

A non-uniform kite is hanging freely from the branch of a tree as shown. Study the figure and answer the following: (a) Fill in the blank. ............... [P, Q, R or S] is the most probable position of its centre of gravity. (b) Support your answer to (a) with a reason.

A radioactive element P emits one α-particle and transforms to a new element Q. What will be the position of the element Q in the periodic table? (a) One group to the left of P (b) One group to the right of P (c) Two groups to the right of P (d) Two groups to the left of P

The following figure shows a small bar magnet falling freely through a copper ring. For the observer at A, the direction of the induced current will be : (a) clockwise when magnet is above and below the ring (b) anticlockwise when magnet is above and below the ring (c) anticlockwise when magnet is above the ring and clockwise when the magnet is below the ring (d) clockwise when magnet is above the ring and anticlockwise when the magnet is below the ring

Curium is a radioactive element with the symbol named in honour of Madam Curie. The graph of number of protons vs number of neutrons for some elements is shown below: (a) Which point on the graph indicates the element Cm? (b) Which point on the graph indicates daughter nucleus after Cm undergoes radioactive decay of 1α followed by 2β? (c) State the mass number of the daughter nucleus.

A ray of light is incident normally on a face of an equilateral prism. The ray gets totally reflected at the second refracting surface. The total deviation produced in the path of the ray is: (a) 30° (b) 60° (c) 90° (d) 120°

Three identical bulbs B1, B2 and B3, each of power rating 18 W, 12 V, are connected to a battery of 12 V as shown. (a) Calculate: (i) the resistance of each bulb (ii) the current drawn from the cell (b) If bulb B3 is removed from the circuit, will the brightness of bulb B1 increase, decrease or remain the same?

(a) Which of the two, alternating current or direct current, produces a varying magnetic field when it flows through a conductor? (b) State the frequency of the alternating current supply in India.

In a closed circuit containing a bulb and a cell, the electromotive force (ε) and the terminal voltage (V) is related as. (Given I is current and r is internal resistance.) (a) V = ε + Ir (b) V = ε – Ir (c) V = ε ÷ Ir (d) V = ε × Ir

A ray of light enters a rectangular glass slab submerged in water at an angle of incidence 55°. Does this ray undergo total internal reflection when it moves from water to glass? Justify your answer. (The critical angle for glass–water interface is 54°)

A metal piece of mass 5 g has thermal capacity 2.5 J K⁻¹. If the mass of the metal is tripled, then its specific heat capacity will be : (a) 7.5 J K⁻¹ (b) 2.5 J K⁻¹ (c) 1.5 J g⁻¹ K⁻¹ (d) 0.5 J g⁻¹ K⁻¹

Two rays PQ and RS are incident on a rectangular glass block as shown in the diagram. Observe the diagram and answer the questions that follow. Which of these two rays will: (a) have greater lateral displacement on emerging out of the block? (b) travel with greater speed in the block? (c) scatter more in the atmosphere?

When a ray of light passes from one optical medium to another, which of the following physical quantities does NOT change? (a) Amplitude of the wave (b) Frequency of the wave (c) Wavelength of the wave (d) Speed of the wave