An aeroplane is flying horizontally with a velocity of 216 km/h at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The […]
The angle between the vectors (i+j) and (j+k) is
Options
(a) 90⁰ (b) 60⁰ (c) 30⁰ (d) 45⁰
Correct Answer:
60⁰
Explanation:
A = i + j, B = j + k
A . […]
For a given velocity, a projectile has the same range R for two angles of projection. If t₁ and t₂ are the times of flight in the two cases, then
Options
(a) t₁t₂ […]
A moving coil galvanometer of resistance 100 Ω is converted to ammeter by a resistance of 0.1 Ω in the circuit. Galvanometer gives full scale deflection at 100 μA. The minimum current in the circuit […]
A bar magnet of pole strength 10 A-m is cut into two equal parts breadthwise. The pole strength of each magnet is
Options
(a) 5 A-m (b) 10 A-m (c) 15 A-m (d) […]
Force required to move a mass of 1kg at rest on a horizontal rough plane (μ = 0.1 and g = 9.8 m/s²) is
Options
(a) 0.98 N (b) 0.49 N (c) 9.8 […]
A body of mass 4 kg is accelerated upon by a constant force travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force […]
An artificial satellite is revolving round the earth in a circular orbit. Its velocity is half the escape velocity. Its height from earth’s surface is
Options
(a) 6400 km (b) 12800 km (c) […]
Periodic time of a satellite revolving above Earth’s surface at a height equal to R, radius of Earth is (g=acceleration due to gravity at Earth’s surface)
Options
(a) 2π√2R/g (b) 4√2√R/g (c) 2π√R/g […]
A charge of 100 μC has a potential at a distance of 9 m is
Options
(a) 10⁶ V (b) 10⁻⁵ V (c) 10⁵ V (d) 10⁻⁶ V
Correct Answer:
10⁵ V
Explanation: […]
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