- What is the wavelength of visible spectrum ? [SSC CPO Sub-Inspector 2005]
A. 1300 A°–3000 A°
B. 3900 A° – 7600 A°
C. 7800 A° – 8000 A°
D. 8500 A° – 9800 A°
Answer –B. 3900 A° – 7600 A°
Explanation-
- Where are mesons found ? (SSC Section Officer Commercial Audit) 2005]
A. Cosmic rays
B. X-rays
C. Gamma rays
D. Laser beam
Answer –A. Cosmic rays
Explanation-
- ‘Cryogenics’ is a science dealing with – [SSC CGL Prelim 2005]
A. high temperatures
B. low temperatures
C. friction and wear
D. growth of crystals
Answer –B. low temperatures
Explanation-
- The surface tension of water on adding detergent to it – [SSC CGL prelm 2002]
A. increases
B. decreases
C. no change
D. becomes zero
Answer –B. decreases
Explanation-
- A periscope works on the principle of [SSC Combined Matric Level (PRE) 2008]
A. refraction
B. total internal reflection
C. diffraction
D. reflection
Answer –B. total internal reflection
Explanation-
- Which colour of light shows maximum deviation when passed through a prism ? [SSC HSl Data Entry Operator & LDC 2010]
A. White
B. Red
C. Violet
D. Green
Answer –C. Violet
Explanation-
- The water from a hand pump is warm in winter because – [SSC (10+2) LCD 2011]
A. Our body is cold in winter and the water appears to be warm
B. The temperature inside the earth is higher than the atmospheric temperature
C. The pumping process causes friction which warms up the water
D. Inside water comes out and absorbs heat from the environment
Answer –B. The temperature inside the
earth is higher than the atmospheric temperature
Explanation-
- A barometer is kept inside a bell jar. Air is slowly pumped out of the jar. – [SSC MTS 2013]
A. The mercury level starts rising
B. The mercury level starts falling
C. The mercury level does not change
D. The bell jar breaks up
Answer –A. The mercury level starts
rising
Explanation-
- Magnetic keepers are used to protect magnets from : [SSC MTS (Non-Tech.) 2014]
A. Earth’s magnetic field
B. effect of other magnets
C. self-demagnetization
D. demagnetization due to heating
Answer –C. self-demagnetization
Explanation-
- Who among the following developed the technology of underground nuclear explosion ? [SSC Section Officer 1997]
A. Dr. Homi J. Bhabha
B. Dr. Vikram Sarabhai
C. Dr. Raja Ramanna
D. Dr. P. K. Iyengar
Answer –A. Dr. Homi J. Bhabha
Explanation-