Physics Test 24...

Two satellites P and Q are moving in different circular orbits around the Earth (radius R). The heights of P and Q from the Earth surface are h_P, and h_Q, respectively, where  The accelerations of P and Q due to Earth's gravity are g_P and g_Q. respectively. If  , what is the value of h_Q?

The terminal voltage of the battery, whose emf is 10 V and internal resistance 1 Ω, when connected through an external resistance of 4 Ω as shown in the figure is:

At any instant of time t, the displacement of any particle is given by 2t – 1 (SI unit) under the influence of force of 5 N. The value of instantaneous power is (in SI unit):

Two bodies A and B of same mass undergo completely inelastic one dimensional collision. The body A moves with velocity v₁ while body B is at rest before collision. The velocity of the system after collision is v₂. The ratio v₁ : v₂ is

10 resistors, each of resistance R are connected in series to a battery of emf E and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased n times. The value of n is:

Light travels a distance x in time t₁ in air and 10x in time t₂ in another denser medium. What is the critical angle for this medium?

An ac source is connected to a capacitor C. Due to decrease in its operating frequency:

The temperature of a gas is -50°C. To what temperature the gas should be heated so that the rms speed is increased by 3 times?

The magnitude and direction of the current in the following circuit is

An electric dipole is placed at an angle of 30° with an electric field of intensity 2 × 10⁵ N C^-1. It experiences a torque equal to 4 N m. Calculate the magnitude of charge on the dipole, if the dipole length is 2 cm.